Trouble P0101 - Mass Air Flow Sensor Range/Performance

Causes of error P0101

• The mass air flow sensor sends a signal to the engine control module (ECM) that is out of range.
• The mass air flow sensor is not functioning properly due to damage or malfunction.
• Electrical wires or the MAF sensor itself are located too close to higher voltage components (such as the alternator, ignition wires, etc.) which can cause interference that affects the signal sent to the vehicle's ECM.
• The problem could also be damaged vacuum hoses, which can lead to various problems and other error codes.
• The MAF sensor must operate within a certain range to be able to send the correct signals to the vehicle's ECM, which is necessary for proper engine operation.

VAZ errors and their solutions

Owners of domestic cars can easily find a problem with their car. This became possible thanks to the use of on-board computers and the introduction of modern equipment diagnostic tools. This article will describe in detail the errors and how to eliminate them in VAZ 2110, 2112, 2114, Kalina, Priora and how to eliminate them.

How to diagnose a car yourself

Do not rush to go to the service center. Although specialists use test benches to detect malfunctions, and their diagnostics are more accurate, every car owner is still able to find out the cause of the problem using information about the error codes of the on-board computer.

To view error codes recorded by the controller:

1. Sit behind the wheel, then press and hold the odometer button. It is located at the bottom of the dashboard.
2. Turn the key in the lock to position “1”. While turning the key, release the button. This will be followed by a quick set of readings on the instruments.
3. After this, press the button again: the display will show the controller firmware version.
4. Finally, press the button the last, third time to display the VAZ controller errors.

VAZ error codes:

• P0030 - Oxygen sensor heater before the converter, control circuit open
• P0031 - Oxygen sensor heater before the converter, control circuit short to ground
• P0032 - Heater of the oxygen sensor to the converter, short circuit of the control circuit to the board. net
• P0036 - Oxygen sensor heater after the converter, control circuit open
• P0037 - Oxygen sensor heater after the converter, control circuit short to ground
• P0038 - Heater of the oxygen sensor after the converter, short circuit of the control circuit to the board. net
• P0102 - Mass air flow sensor circuit, low signal level
• P0103 - Mass air flow sensor circuit, high signal level
• P0112 - Air temperature sensor circuit, low signal level
• P0113 - Air temperature sensor circuit, high signal level
• P0116 - Coolant temperature sensor circuit, signal out of acceptable range
• P0117 - Coolant temperature sensor circuit, low signal level
• P0118 - Coolant temperature sensor circuit, high signal level
• P0122 - Throttle Position Sensor Circuit Low Signal
• P0123 - Throttle Position Sensor Circuit High Signal
• P0130 - The oxygen sensor before the converter is faulty
• P0131 - Oxygen sensor circuit to converter, low output level
• P0132 - Oxygen sensor circuit to converter, high output level
• P0133 - Oxygen sensor circuit to the converter, slow response to changes in mixture composition
• P0134 - The oxygen sensor circuit to the converter is inactive
• P0136 - The oxygen sensor after the converter is faulty
• P0137 - Oxygen sensor circuit after the converter, low signal level
• P0138 - Oxygen sensor circuit after the converter, high signal level
• P0140 - The oxygen sensor circuit after the converter is inactive
• P0141 - Oxygen sensor after the converter, heater is faulty
• P0171 - Fuel supply system too lean
• P0172 - Fuel system too rich
• P0201 - Cylinder 1 injector, control circuit open
• P0202 - Cylinder 2 injector, control circuit open
• P0203 - Cylinder 3 injector, control circuit open
• P0204 - Cylinder 4 injector, control circuit open
• P0217 - Engine temperature is higher than permissible
• P0230 - Fuel pump relay circuit malfunction
• P0261 - Cylinder 1 injector, control circuit short to ground
• P0263 - Injector driver fault 1
• P0264 - Cylinder 2 injector, control circuit short to ground
• P0266 - Faulty injector driver 2
• P0267 - Cylinder 3 injector, control circuit short to ground
• P0269 - Injector 3 driver malfunction
• P0270 - Cylinder 4 injector, control circuit short to ground
• P0262 - Cylinder 1 injector, control circuit shorted to on-board network
• P0265 - Cylinder 2 injector, control circuit shorted to on-board network
• P0268 - Cylinder 3 injector, control circuit shorted to on-board network
• P0271 - Cylinder 4 injector, control circuit shorted to on-board network
• P0272 - Faulty injector driver 4
• P0300 - Random/multiple misfires detected
• P0301 - Cylinder 1, misfire detected
• P0302 - Cylinder 2, misfire detected
• P0303 - Cylinder 3, misfire detected
• P0304 - Cylinder 4, misfire detected
• P0326 - Knock sensor circuit, signal output out of acceptable range
• P0327 - Knock sensor circuit low signal
• P0328 - Knock sensor circuit, high signal level
• P0335 - Crankshaft position sensor circuit is faulty
• P0336 - Crankshaft position sensor circuit, signal out of acceptable range
• P0337 - Crankshaft position sensor, short to ground
• P0338 - Crankshaft position sensor, open circuit
• — Malfunction of the camshaft position sensor
• P0342 - Phase sensor circuit, low signal level
• P0343 - Phase sensor circuit, high signal level
• P0346 - Phase sensor circuit, signal output out of acceptable range
• P0351 - Ignition coil of cylinder 1 (1-4), control circuit open
• P0352 - Ignition coil of cylinder 2 (2-3), control circuit open
• P0353 - Ignition coil of cylinder 3, control circuit open
• P0354 - Ignition coil of cylinder 4, control circuit open
• P0363 - Misfire detected, fuel supply to idle cylinders is turned off
• P0422 - Neutralizer efficiency below threshold
• P0441 - Gasoline vapor recovery system, incorrect air flow through the canister purge valve
• P0444 - Canister purge valve, control circuit open
• P0445 - canister purge valve, control circuit short to ground or on-board network
• P0480 - Fan relay, control circuit open
• P0481 - Cooling fan 2 circuit malfunction
• P0500 - Vehicle speed sensor is faulty
• P0506 - Idle system, low engine speed
• P0507 - Idle system, high engine speed
• P0511 - Idle speed control, control circuit faulty
• P0560 - On-board network voltage is below the system operability threshold
• P0562 - On-board voltage, low level
• P0563 - On-board voltage, high level
• P0601 - Engine control system controller, ROM checksum error
• P0615 - Additional starter relay, control circuit open
• P0616 - Additional starter relay, control circuit short to ground
• P0617 - Additional starter relay, control circuit shorted to on-board network
• P0627 - Fuel pump relay, control circuit open
• P0628 - Fuel pump relay, control circuit short to ground
• P0629 - Fuel pump relay, control circuit shorted to on-board network
• P0645 - Air conditioning compressor clutch relay, control circuit open
• P0646 - Air conditioning compressor clutch relay, control circuit short to ground
• P0647 - Air conditioning compressor clutch relay, control circuit shorted to board. net
• P0650 - Malfunction indicator lamp, control circuit faulty
• P0654 - Instrument cluster tachometer, control circuit faulty
• P0685 - Main relay, control circuit open
• P0686 - Main relay, control circuit short to ground
• P0687 - Main relay, control circuit shorted to on-board network
• P0691 - Fan relay, control circuit short to ground
• P0692 - Fan relay, control circuit shorted to on-board network
• P1102 - Oxygen Sensor Heater Resistance Low
• P1115 - Faulty oxygen sensor heating circuit
• P1123 - Rich mixture at idle
• P1124 - Lean mixture at idle
• P1127 - Rich mixture at Partial Load
• P1128 - Lean mixture in Partial Load mode
• P1135 - Oxygen sensor heater circuit 1 open, short circuit
• P1136 - Rich mixture in Light Load mode
• P1137 - Lean mixture in Light Load mode
• P1140 - Measured load differs from calculation
• P1141 - Post-converter oxygen sensor 1 heater malfunction
• P1171 - Low level CO potentiometer
• P1172 - High level CO potentiometer
• P1301 - Cylinder 1, misfire detected, critical for the converter
• P1302 - Cylinder 2, misfire detected, critical for the converter
• P1303 - Cylinder 3, misfire detected, critical for the converter
• P1304 - Cylinder 4, misfire detected, critical for the converter
• P1386 - Knock Channel Test Error
• P1410 - Canister purge valve control circuit short circuit to +12V
• P1425 - Canister purge valve control circuit short circuit to ground
• P1426 - Canister purge valve control circuit open
• P1500 - Fuel pump relay control circuit open
• P1501 - Short circuit to ground of the fuel pump relay control circuit
• P1502 - Short circuit to +12V fuel pump relay control circuit
• P1509 - Idle Air Control Circuit Overload
• P1513 - Idle air control circuit short circuit to ground
• P1514 - Idle air control circuit short circuit to +12V, open
• P1541 - Fuel pump relay control circuit open
• P1570 - Immobilizer, circuit faulty
• P1602 - Engine control system controller, power supply loss
• P1606 - Rough road sensor circuit, signal out of acceptable range
• P1616 - Rough Road Sensor Circuit Low Signal
• P1617 - Rough road sensor circuit, high signal level
• P2301 - Ignition coil of cylinder 1 (1-4), control circuit shorted to board. net
• P2303 - Ignition coil of cylinder 2 (2-3), control circuit shorted to board. net
• P2305 - Ignition coil of cylinder 3, control circuit shorted to board. net
• P2307 - Ignition coil of cylinder 4, control circuit shorted to board. net

Errors in ME17.9.7 and M74 controllers

Mass air flow sensor

• P0101 - Diagnosis of reality. Air flow is out of range
• P0102 - Low value diagnostics. The signal period is greater than the upper maximum permissible value
• P0103 - High value diagnostics. The signal period is less than the lower maximum permissible value

Intake air temperature sensor

• P0112 - Low value diagnostic. Voltage is less than the lower maximum permissible value
• P0113 - Diagnostics high value. Voltage is greater than the upper maximum permissible value

Coolant temperature sensor

• P0116 - Diagnosis of reality. Temperature is less than calculated value
• P0117 - Low value diagnostic. Voltage is less than the lower maximum permissible value
• P0118 - Diagnostics high value. Voltage is greater than the upper maximum permissible value

Throttle Position Sensors

• P2135 - Diagnostics of the mismatch between the signals of two sensors. The sensor voltages differ by the threshold value
• P0122 - Low value diagnostic (sensor 1). Voltage is less than the lower maximum permissible value
• P0123 - High value diagnostic (sensor 1). Voltage is greater than the upper maximum permissible value
• P0222 - Low value diagnostic (sensor 2). Voltage is less than the lower maximum permissible value
• P0223 - High value diagnostic (sensor 2). Voltage is greater than the upper maximum permissible value

Accelerator pedal position sensors

• P2138 - Diagnostics of the mismatch between the signals of two sensors. The sensor voltages differ by the threshold value
• P2122 - Low value diagnostic (sensor 1). Voltage is less than the lower maximum permissible value
• P2123 - High value diagnostic (sensor 1). Voltage is greater than the upper maximum permissible value
• P2127 - Low value diagnostic (sensor 2). Voltage is less than the lower maximum permissible value
• P2128 - High value diagnostic (sensor 2). Voltage is greater than the upper maximum permissible value

Injectors

• P0201, P0202, P0203, P0204 - Diagnostics of open control circuit. Driver diagnostics
• P0261, P0264, P0267, P0270 - Diagnosis of control circuit short circuit to ground.
• P0262, P0265, P0268, P0271 - Diagnostics of a short circuit in the control circuit to the on-board network.

Control oxygen sensor

• P0130 - Signal circuit integrity diagnostics. Voltage is less than the lower maximum permissible value or greater than the upper maximum permissible value
• P0131 - Low value diagnostic. Voltage is less than the lower maximum permissible value
• P0132 - Diagnostics high value. Voltage is greater than the upper maximum permissible value
• P0133 - Slow Response Diagnosis. The signal period is greater than the maximum permissible value
• P0134 - Activity Diagnostics. Voltage is less than the upper maximum permissible value and greater than the lower maximum permissible value
• P0030 - Diagnostics of open circuit of the heater. Driver diagnostics
• P0031 - Diagnostics of a short circuit of the heater circuit to ground.
• P0032 - Diagnostics of a short circuit of the heater circuit to the on-board network.

Diagnostic oxygen sensor

• P0136 - Signal circuit integrity diagnostics. Voltage is less than the lower maximum permissible value or greater than the upper maximum permissible value
• P0137 - Low value diagnostic. Voltage is less than the lower maximum permissible value
• P0138 - Diagnostics high value. voltage is greater than the upper maximum permissible value
• P0140 - Activity Diagnostics. Voltage is less than the upper maximum permissible value and greater than the lower maximum permissible value
• P0036 - Heater circuit open circuit diagnostics. Driver diagnostics
• P0037 - Diagnostics of a short circuit of the heater circuit to ground.
• P0038 - Diagnostics of a short circuit of the heater circuit to the on-board network.

Fuel supply system

• P0171 - Diagnosis of poor mixture composition. Fuel correction coefficients are greater than the upper maximum permissible value
• P2187 - Diagnosis of poor mixture composition (at idle).
• P0172 - Diagnostics of the richness of the mixture. Fuel correction coefficients are less than the lower maximum permissible value
• P2188 - Diagnostics of the richness of the mixture (at idle).
• Engine overheating - P0217. Engine temperature monitoring

Misfire for toxicity

• P0300, P0301, P0302, P0303, P0304 - Diagnosis of the presence of misfires affecting toxicity. The number of misfires is greater than the maximum permissible value

Misfire to protect the converter

• P0363, P1301, P1302, P1303, P1304 - Diagnosis of the presence of misfires affecting the converter. The number of misfires is greater than the maximum permissible value

Knock sensor

• P0326 - Low value diagnostics. Normalized signal level is outside the acceptable range
• P0327 - Low value diagnostics. The normalized signal level is less than the lower maximum permissible value
• P0328 - High value diagnostics. The normalized signal level is greater than the upper maximum permissible value

Crankshaft position sensor

• P0335 - Signal presence diagnostics. Change in air flow in the absence of a signal from the crankshaft position sensor above the maximum permissible value
• P0336 - Diagnosis of reality. The controller counts the wrong number of teeth per revolution of the crankshaft

Camshaft position sensor

• P0340 - Diagnostics of signal presence. The sensor signal does not change when the engine is running
• P0342 - Low value diagnostics. Low sensor signal for several crankshaft revolutions
• P0343 - High value diagnostics. High sensor signal for several crankshaft revolutions

Ignition coils

• P0351, P0352 - Diagnostics of open circuit. The primary circuit current is less than the maximum permissible value
• P2301, P2304 - Diagnostics of a short circuit to the on-board network. The primary circuit current is greater than the maximum permissible value
• Neutralizer - P0422. Determining the capacity of stored oxygen by comparing the amplitude range of the control and diagnostic oxygen sensors

Canister purge valve

• P0441 - Functional diagnostics. The response of the idle control system is greater or less than the maximum permissible value
• P0459 - Diagnostics of a short circuit to the on-board network. Driver diagnostics
• P0458 - Diagnostics of a short circuit to ground.
• P0444 - Open circuit diagnostics.

Cooling fan relay 1

• P0692 - Diagnostics of a short circuit to the on-board network. Driver diagnostics
• P0691 - Diagnostics of a short circuit to ground.
• P0480 - Open circuit diagnostics.

Cooling fan relay 2

• P0694 - Diagnostics of a short circuit to the on-board network. Driver diagnostics
• P0693 - Diagnostics of a short circuit to ground.
• P0481 - Open circuit diagnostics.
• Cooling fan - P0485. Diagnostics of cooling fan supply voltage
• Vehicle speed sensor - P0500. Signal presence diagnostics
• Brake pedal sensor - P0504. Diagnostics of sensor signal mismatch time

Onboard voltage

• P0560 - Diagnosis of value validity. voltage in circuits Cl. "30" and Cl. “15” differs by the threshold value
• P0562 - Low value diagnostic. Voltage is less than the lower maximum permissible value
• P0563 - High value diagnostic. Voltage is greater than the upper maximum permissible value
• P1602 - Supply voltage diagnostics. Power failure

Controller

• P1640 - EEPROM diagnostics. EEPROM test error
• P0601 - Software checksum diagnostics. Invalid checksum
• P0606 - Internal controller checks. ADC is faulty
• P2105 - The monitoring module is faulty.

Starter relay

• P0615 - Open circuit diagnostics. Driver diagnostics
• P0616 - Diagnosis of a short circuit to ground.
• P0617 - Diagnostics of a short circuit to the on-board network.

Fuel pump relay

• P0627 - Open circuit diagnostics. Driver diagnostics
• P0628 - Diagnosis of a short circuit to ground.
• P0629 - Diagnostics of a short circuit to the on-board network.

A/C clutch relay

• P0645 - Open circuit diagnostics. Driver diagnostics
• P0646 - Diagnostics of a short circuit to ground.
• P0647 - Diagnostics of a short circuit to the on-board network.

How to remove information about corrected errors from the controller memory

Sometimes, after troubleshooting, error messages remain in memory and periodically appear on the panel.

To clear an error code from memory:

• Write down and check for irrelevant codes that appear.
• Reset the daily mileage readings by pressing the corresponding button, after which the error code is guaranteed to be deleted from memory.

How to get rid of the "Check Engine" message

Sometimes drivers see a glowing orange icon at the bottom of the instrument panel. This is how the computer reports an engine malfunction. Self-diagnosis will not allow you to determine and correct the cause of the motor problem. However, the error often appears on serviceable cars. Therefore, to reset the problem code:

• Turn on the ignition, but do not start the car.
• Open the hood and use a wrench to loosen and remove the negative terminal on the battery.
• After a minute, return the terminal to its original position.
• Close the hood and turn the ignition key to position “0”.
• Turn the ignition back on and start the engine. After a short time the error should disappear.

If the above instructions did not help, it is worth carrying out a more accurate diagnosis of the car at a service center in order to correct the problem at an early stage.

How does a mechanic diagnose a P0101 code?

When diagnosing this error, the mechanic will do the following:

• Connects the OBD-II scanner to the vehicle's diagnostic connector and reads all stored data and error codes
• Visually inspect the engine, then clear the fault codes from the computer's memory and test drive the vehicle to see if P0101 appears again.

If the error code appears again:

• Check the electrical connector of the mass air flow sensor for looseness.
• Check the electrical wires related to the mass air flow sensor for damage
• Find out if electrical wires or the MAF sensor itself are located too close to higher voltage components

Decoding codes

Well, if you succeed in checking your car for faults, then you need to decipher the combinations of errors, otherwise why do you need diagnostics at all?

Self-diagnosis

Let's look at the decoding of combinations of faults that you can read when checking the Lada Priora yourself.

The arrows on the dashboard move to maximum values ​​when performing self-diagnosis of the vehicle, and all icons on the panel are lit

Please note: if the button for switching functions of the on-board computer is not pressed for more than 10 seconds, the instrument panel will return to operating status.

Failures in the ignition system

If you were unable to check your VAZ Priora yourself, you can do this using a special tester. In this case, the error code will be a combination of a letter and four numbers:

• P - means a breakdown in the operation of the electronic systems of the internal combustion engine;
• C - malfunction of the chassis;
• B - breakdown in the electronics of the car interior;
• U - indicates an error in the joint operation of different systems;
• the number 0 indicates the OBD-2 code;
• 1 and 2 - enterprise code;
• 3 - reserve code.

Connector for self-diagnosis of a VAZ Priora car

Fuel and air system error codes

How to read errors?

In order to read errors, you need to connect a laptop or tablet PC to the car via a special K-line cable. Let's look at what tools will be needed to connect the car to the computer and determine error codes:

1. K-line cable.

   K-line cable for connecting a laptop to a car

2. Laptop or tablet.
3. Special software.

In order to connect, you need to find a connector for the cable. It is located under the steering column. Now you need to connect the cable itself and then the USB connector. The following programs are considered optimal for use: VAG-COM USB KKL adapter; VAZ diagnostic program for models, Priora, Kalina, Grant; USB driver Autocom cdp pro cars USB; ScanMaster 2.1 in Russian for ELM327.

Troubleshooting and reset

Eliminating ECU errors is quite simple. In the reading program, you need to find the desired fault and decipher it. Then, it is recommended to fix the problem that caused the error. The last step is reset. It can be found in program tools or actions.

Location of the connector for connecting to the ECU

Possible location of the connector for connecting to the ECU

Many car enthusiasts make a mistake when working with software, because they “reset” not the errors themselves, but the entire software, thus leaving only the car software shell. After such actions, usually, the car may not start and software adjustment of the equipment or replacement of the entire software as a whole is required. Therefore, in this case, it is recommended to contact a car service, where they will do everything correctly.

Common mistakes when diagnosing code P0101

• The most common mistake when diagnosing a P0101 code is to hastily replace the MAF sensor without first checking the associated electrical wires and connector for damage.
• It is also a mistake to neglect to check the mass air flow sensor for excessive carbon buildup before replacing it. Sometimes the problem can be solved by cleaning the sensor using a special cleaner designed for mass air flow sensors.
• Another mistake is neglecting to check the vacuum hoses for wear and damage.

Diagnostics

There are two ways to set error codes for VAZ 2114 injector 8 valves. However, each method has unique advantages and disadvantages.

Self-diagnosis of VAZ 2114: error codes and their interpretation

The self-diagnosis method does not require the driver to have complex instruments or additional units. To complete the procedure, the car itself is enough.

The standard sequence of actions looks like this.

1. Press the odometer reset button.
2. Turn the ignition key to position No. 1 (turn on the on-board electrics).
3. Release the mileage reset button. After this, the instrument arrows will make a full revolution and return to their place.
4. Press the reset button a second time and release. The command displays the firmware version indicator.
5. Repeat step No. 4 - this will display error codes on the on-board computer.

If the sequence of actions is performed correctly, all indicators will light up and the display will show a two-digit fault code.

Note!

A failure signal may be a lack of response from the indicator. In this case, it is necessary to check the circuit coming from the device.

The most common error codes for the VAZ 2114 panel, occurring in 90% of cases:

• 1 – microprocessor failure, flashing required;
• 2 – error code 2 VAZ 2114 indicates that there is an interruption or disruption in the wiring of the float sensor inside the gas tank;
• 4 – electrical wiring short circuit, voltage limit exceeded;
• 8 – error code 8 on the VAZ 2114 indicates a drop in voltage in the network, the battery may have run out;
• 12 – in the VAZ 2114, error code 12 indicates that the warning lamp is not functioning properly;
• 13 – open circuit of the oxygen sensor;
• 14 – error code 14 on the VAZ 2114 warns the driver that the engine has overheated or the antifreeze temperature sensor has shorted;
• 15 – short circuit or DTOZh has failed;
• 16 – exceeding the permissible voltage limit of the on-board network;
• 17 – BS voltage has dropped critically, battery discharge is allowed;
• 19 – DPKV does not respond or there is a short circuit on the line;
• 21-22 – incorrect response of the TPS, possible short circuit or wiring break;
• 23/25 – short circuit of the throttle position sensor;
• 24 – speedometer failure, power cords may be broken;
• 27/28 – CO sensor worn out or broken;
• 33/34 – problems with the mass air flow sensor, possible power loss or short circuit;
• 35 – IAC sensor has failed, can only be treated by complete replacement;
• 41 – incorrect phase distribution covered or shorted;
• 42 – the circuit has failed or the wires of the electronic ignition unit have been broken;
• 43 – mixture detonation sensor is faulty;
• 44/45 – there is a violation of the fuel supply to the engine, the system may trip, jerks appear during acceleration, and it picks up speed poorly;
• 51 – ROM is acting up;
• 52 – similar for RAM;
• 53 – potentiometer failure;
• 54 – break in wiring for octane corrector;
• 55 – excessive leanness of the mixture during acceleration;
• 61 – interruptions in the operation of the lambda probe.

In some cases, errors may be superimposed on each other if the failure is similar. For example, if errors 1 and 4 intersect, the panel will indicate "5".

It is important to know that after viewing, VAZ 2114/2115 error codes do not disappear on their own after repairs are performed. They need to be forced reset. To complete the work you will need a simple sequence of actions:

• turn on the car ignition;
• remove the terminals from the battery;
• wait 20-30 seconds;
• return the clamps to their place.

This also needs to be done if you are planning a trip to a service station. Having discovered the instructions from the on-board computer, the technicians will correct these problems, which will definitely be more expensive.

The disadvantages of an independent procedure include the low accuracy of the data. On-board diagnostics only show the general direction vector where the fault should be looked for.

Check using diagnostic equipment

You can identify error codes for VAZ 2115 and 2114 using a laptop with a special program. The tool is connected to the vehicle's test socket through a set of adapters. The wizard configures the software, and after diagnostics, one or more faults will be displayed on the computer screen in the form of a five-digit code.

The first part is the letter:

• B – damage to body panels;
• C – chassis or suspension malfunction;
• P – electrical, engine or transmission disorder;
• U – damage to the terminal for information exchange.

The second part is a single digit:

• 0 – typical indicator according to the SAE standard;
• 1/2 – conveyor failure code;
• 3 – reserve.

The next element is the breakdown group indicator:

• 1/2 – defect in the fuel/air line;
• 3 – ignition and related elements;
• 4 – catalyst;
• 5 – XO of the power plant;
• 6 – ECM and related wiring;
• 7/8 – transmission blocks.

The final two numbers point directly to the problem itself.

How serious is P0101?

• When the P0101 error code appears, there are usually no serious problems with the vehicle's drivability, however, if this code is detected, it is recommended that you contact a qualified technician as soon as possible to diagnose and repair the error.
• Under certain circumstances, damage or failure of the mass air flow sensor can lead to increased fuel consumption, unstable engine operation, and problems starting the engine. In some cases, damage to internal engine components may occur.
• Often, if the Check Engine Light comes on immediately after starting the engine, the OBD-II system can be reset and the vehicle will continue to operate normally.

Common Problems Causing Code P0101 on Different Vehicles

In some GM and Chevrolet cars and trucks, code P0101 can be caused by a clogged catalytic converter. A clogged catalytic converter can be checked by measuring intake vacuum and exhaust backpressure. Associated symptoms may include misfire with codes P0300 to P0308, lack of traction under heavy load or during acceleration, and overheating of the catalyst.

Another problem in some GM vehicles is leaking intake manifold gaskets. One of the symptoms of a leaking gasket is rough idle when cold.

On vehicles with an oil-soaked air filter, oil from the filter can contaminate the air flow sensor element, causing a P0101 code or other MAF-related codes.

In some Volvo vehicles, the P0101 code can be caused by a dirty throttle body or vacuum leaks in the positive crankcase ventilation system (such as the vacuum line to the oil separator). A dirty throttle body will need to be cleaned and the intake manifold will need to be checked for air leaks.

The repair technical bulletin for some 2011-2012 Nissan Altima, Maxima and Sentra models recommends reprogramming the ECU if the P0101 code persists and there are no drivability problems.

What repairs can fix the P0101 code?

To resolve error P0101, you may need to:

• Check for the presence of the error code using a scan tool, clear the code from the computer's memory, and test drive the vehicle to see if the P0101 code appears again

If the error code appears again:

• Reconnecting, Repairing, or Replacing the Mass Air Flow Sensor Electrical Connector
• Repair or replacement of electrical wires related to the mass air flow sensor
• Replacing worn or damaged vacuum hoses

Additional comments for troubleshooting P0101

• Many high-mileage vehicles have short-term problems with sensors, which usually occur when the engine is started or the transmission is subjected to prolonged stress.
• Often, if the Check Engine Light comes on but the vehicle continues to operate normally, the OBD-II system can be reset and the problem will be resolved. This is why it is important to check for an error code using a scanner and clear the code from the computer's memory before performing any repair work.

Conditions for generating error code P1514

For different brands and even car models, the conditions for generating the P1514 code may differ, albeit slightly. Let's look at this using the example of domestic injection VAZs. So, for an IAC closure error to form, the following conditions must be met:

• the car engine is started;
• the DC voltage value in the vehicle’s on-board electrical circuit is in the range from 7 to 16 V;
• The electronic engine control unit, while checking the idle speed regulator, detected a lack of load at the output (no electrical signal).

When the above conditions are met, the Check Engine warning light comes on immediately.

VAZ 2114 fault codes with explanations

The manufacturer of a budget car has provided the possibility of self-repairing the car.
VAZ 2114 error codes can be read by yourself or using external equipment. Typical symbols are displayed on the dashboard and indicate the presence of a specific problem in the on-board circuits of the machine. In the minimum configurations, the indication is made as a special light on the tidy. More advanced versions, which have a BC on board with a remote display, display the indication on a special screen. This makes it easier to read the data and understand where exactly the fault is located. All fault codes are displayed in two-digit codes, which greatly complicates the repair procedure. On-board systems can only indicate the area where the problem is located. For more specific diagnostics, you will need a special scanner.