Error code P0303 – misfire detected in cylinder 3

The main reasons why error P0300 occurs

If it is not a general problem of multiple misfires , but for a specific cylinder: p0301, p0302, p0303, p0304 or others, the situation is simplified and most likely lies in the ignition system . In such cases, error P0363 may also be displayed, but it also indicates that the fuel supply to the cylinder is blocked.

How does a mechanic diagnose a P0303 trouble code?

When diagnosing the P0303 trouble code, a mechanic will do the following:

• Reads all stored error codes using an OBD-II scanner
• Review all data stored in ECM memory
• Clear error codes from the ECM and test drive the vehicle to see if P0303 appears again
• Inspects major components and associated wiring for wear and damage, and performs a thorough check for leaks
• Check the misfire counter in cylinder 3
• Will check if there is an intake air leak or any problems with fuel injection
• Check the spark plugs

On which cars is this problem most common?

The problem with code P0303 can occur on different machines, but there are always statistics on which brands this error occurs more often. Here is a list of some of them:

• Audi (Audi a4, Audi a6)
• BMW (BMW E46)
• Chery (Chery Tiggo)
• Chevrolet (Chevrolet Aveo, Cruz, Orlando, Trailblazer)
• Chrysler (Chrysler Voyager, PT Cruiser)
• Dacia (Dacia Largus)
• Daewoo (Daewoo Gentra, Nexia)
• Dodge (Dodge Caravan, Stratus)
• Fiat
• Ford (Ford Windstar, Mondeo, Fiesta, Figo, Focus, Fusion)
• Honda (Honda Accord, Civic)
• Hyundai (Hyundai Accent, Getz, Santa Fe, Solaris, Tucson, Elantra)
• Infiniti
• Jeep (Jeep Grand Cherokee, Liberty)
• Kia (Kia Rio, Sid, Sportage)
• Lexus (Lexus rx300)
• Mazda (Mazda 3, Mazda 6, Mazda cx7, Tribute, MPV)
• Mercedes
• Mitsubishi (Mitsubishi Galant, Lancer, Space Star, L200)
• Nissan (Nissan Almera, Qashqai, Terrano)
• Opel (Opel Astra, Vectra, Zafira, Corsa, Meriva)
• Peugeot (Peugeot 307, 308)
• Renault (Renault Duster, Logan, Sandero)
• Skoda (Skoda Yeti, Octavia, Fabia)
• Ssangyong
• Subaru (Subaru Outback, Forester)
• Suzuki (Suzuki Grand Vitara)
• Toyota (Toyota Camry, Corolla, Prius, Fielder)
• Volkswagen (Volkswagen Golf, Jetta, Caddy, Passat, Polo Sedan, Touareg, Tiguan)
• Volvo
• VAZ 2110, 2112, 2114, 2115
• Volga Cyber
• Gazelle Business
• Lada Kalina, Largus, Niva, Priora
• UAZ Patriot

With fault code P0303, you can sometimes encounter other errors. The most common ones are: P0016, P0102, P0113, P0171, P0174, P0183, P0203, P0267, P0300, P0301, P0302, P0304, P0305, P0306, P0316, P0363, P0400, P0420, P1303.

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Additional comments for troubleshooting P0303

To properly diagnose a P0303 trouble code, a mechanic will need an advanced scanner that will not only read stored trouble codes, but also view sensor readings in real time. This data can help determine the root cause of the error.

The recommended service interval for replacing spark plugs is usually indicated in the vehicle's service book. Worn or damaged spark plugs are one of the most common causes of cylinder misfire, especially in high-mileage vehicles. If the vehicle is equipped with an ignition distributor with a cap and slider, these must also be replaced according to the vehicle manufacturer's recommendations. These components are mechanical and wear out over time. Spark plug wires are usually replaced when the spark plugs themselves are replaced.

Newer vehicles may be equipped with ignition coils, which typically last longer than the above components. To quickly determine whether the problem is a faulty ignition wire or coil, you must move the wire and/or ignition coil to a different cylinder. If the error code appears again, it is a sign that a worn or damaged ignition wire and/or coil is causing the cylinder to misfire.

“Error 303” on my Kalina and my fight against it

A modern electronic engine control system for a simple car owner is a real “black box”, a kind of “thing in itself”.
Practice shows that this is a very reliable system. But if she starts to “fool”, get ready for a long struggle.

I’ll tell you about my months-long search for the truth, which I have been doing for almost the entire past year.

My "battlefield"

Car Lada-Kalina 2010 release. I bought it new, so I am the first owner and I know its entire life thoroughly.

The engine is 16-valve, volume 1.4 liters. The ignition system is a coil for each spark plug. Equipment - with air conditioning. (This is an important nuance and I will explain why later.) I only refueled with 95. Engine maintenance is according to regulations. At the time of the “glitches” the mileage was about 80 thousand.

Symptoms of the disease

My work involves daily travel.

Most of the mileage is in Moscow. Endless crush in traffic jams. Imagine a typical rush hour drive, for example, along Kutuzovsky from the center. Over and over again you move the car a meter, then two. Even if you drive, even in first gear the idle speed is too high. You have to squeeze the clutch every now and then. And so - 5-6 kilometers...

Often you just stand still for 2-5-10 minutes, and the engine rattles at idle.

And suddenly a subtle “triple” appears at idle (under load everything is normal!). The engine begins to “sausage” more and more. Finally, after 10-20 minutes, the “yellow helicopter” light begins to blink and the message “cod 0303” appears on the computer. This means “multiple misfires in the third cylinder.”

If you do nothing, the idle will continue to deteriorate, interruptions in engine operation will increase, and in the future they will become noticeable even under load. The car really drives “on three pots”.

And then the time will come to PERFORM A MIRACLE.

You need to reset the error on the trip computer and normal engine operation will be restored immediately. Until the next traffic jam.

No traffic jams - no problems. When traveling to the country - none.

What I did and what is the result:

Spark plugs: Replaced them, although they were not old yet. - No changes.

Ignition coil: I assumed that the coil on the 3rd cylinder was to blame (the operating and repair manual hinted at this). Replaced the coil - no change.

Power system: He put forward a hypothesis: if problems begin at idle, something is wrong in the power system, or more precisely in the “idle system”. Although the car is fuel-injected, air flows into the engine at idle in the same way as in the carburetor - through a tiny nozzle.

I removed the air pipe and “blindly” blew everything out with injection system cleaner.

Miracle! It's all gone! And for a whole week I thought that I had found and fixed the problem. And then everything became the same as before.

Crankshaft sensor: I put forward a hypothesis: “error 303” occurs due to a signal from the crankshaft sensor. The sensor receives a signal precisely during the working stroke of the 3rd cylinder.

I removed the sensor. Its “stigma” turned out to be covered with metal shavings. Apparently, he caught it in a car service when they were changing my alternator belt. (Contrary to my principles, I gave this work to a service center. Due to the air conditioner installed on the engine, to replace the alternator belt, you need to remove the front engine mount. I was afraid to do this on my own).

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Recommendations for checking and troubleshooting

The first thing you should check when misfiring is the explosive wires and ignition coils (module), they often turn out to have broken insulation, a break, or an oily surface. We measure the wires with a multimeter (normal resistance is about 4 - 10 kOhm), in resistance mode, but to check individual ignition coils, you just need to swap places with a known working cylinder and clear the errors again. If the code has changed to the number of another cylinder, then the coil is faulty. The ignition module is more complicated; it needs to be checked with a tester.

The second in line are the spark plugs - a damaged electrode, incorrect gap, or oil deposits lead to failure or unstable operation of the spark plug.

Having unscrewed the spark plug for inspection, then what else can be done - measure the compression in the cylinder . Reduced or absent compression leads to insufficient compression, and therefore creates problems with ignition of the mixture.

Clogged fuel injectors provoke interruptions in the supply of fuel to the combustion chamber, but, unfortunately, without a stand it will not be possible to quickly check them. And the only thing that can be recommended in such a situation is to refuel with fuel with a higher octane number, and drive the car for some time at high speeds (4-5 thousand/rev).

A fuel filter that has not been changed for a long time or bad gasoline very often becomes the culprit for the unstable operation of the injectors. Therefore, remember the last time the filter was changed, and at what gas station you filled it with fuel.

A stuck EGR valve or leaks through the intake manifold gasket , which can also cause random misfires, can be difficult to determine on your own, so when doing computer diagnostics, pay attention to such a parameter as long-term fuel correction . It will show how much the ECU compensates for the imbalance in the air/fuel ratio. When this parameter on a particular cylinder differs by more than 10%, this may indicate a vacuum leak or air leak.

More rare cases that cause a violation of the ignition order, such as disrupted valve timing or a violation of the exhaust gas outlet , are controlled by the control unit and, in addition to the P030X code, other errors will appear regarding the catalyst, lambda probe, camshafts.

I hope all these tips will help you not only figure out the cause of the malfunction, but also fix it yourself, without outside help, without spending a ruble, or pay only for a specific part, and not waste money on replacing everything that can fail .

Error 0303 Priora 16 valves causes

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Lada Priora 2170 2007
126 engine, pistons from 124. Bosch ECU 7.9.7. On the on-board vehicle, errors 0300 and 0303 appeared. We swapped the coils for 2-3 pots, and an error about the third pot appeared again. the candles waved in places, again in the third. Why dig guys? Thank you. and greetings from the Samara branch

p.s. Mordovia is covered in snow, let's ask, how's the weather?

Dig into the compression

Pagoda Shvakh, slush snow melted in the southern Urals

check the wiring to the coil

A year ago I encountered something similar. As a result, a leak in the injectors was first detected (along the way I changed the gaskets in the manifold, etc.) and after a while it became clear that the mass air flow sensor was tired.

Therefore, on a cold engine, take carb cleaner and spray it near the ramp and manifold. By the reaction of the engine you will understand what and how.

Check the MAF voltage when the ignition is on, but the engine is not running. The new one will show 0.996. According to various sources, the upper limit is 1.05. But in practice, with this indicator, the motor will still work.

The compression on my 1st cylinder was 1 unit different from the others - that’s where the leaks occurred during suction.

Next, decarbonization, replacement of gaskets and rubber bands, crimping with new clamps and everything became a herringbone.

As for the injectors, I don’t quite understand how they can be modified with a filter and mesh. When I removed my rings to replace them, I put them on the stand purely for fun - they worked well.

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