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P0303

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P0303 OBD-II Trouble Code: Cylinder 3 Misfire Detected
P0303 code definition P0303 is a generic diagnostic trouble code (DTC) indicating an issue with the firing of cylinder 3. This code...

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Engine misfiring

It is possible that the spark plugs and wires, or even the ignition coil, may require replacement, but the intake manifold is a highly unlikely cause of this trouble code. Any issues related to misfires are usually found in the...

Car stalling when stopped

The codes all reference engine misfires. Continued misfires can cause the catalyst to fail and block the exhaust. The past diagnosis you had that the coils could be bad was correct. The coils (https://www.yourmechanic.com/services/ignition-coil-replacement) and plugs should be replaced (https://www.yourmechanic.com/services/spark-plugs-replacement)...

Can't get power at all. Misfire with code P0303.

Hi there. The code P0303 (https://www.yourmechanic.com/article/p0303-obd-ii-trouble-code-cylinder-3-misfire-detected-by-spencer-clayton_2) means that cylinder number 3 has a misfire. There are three ways that the cylinder number 3 can be misfiring. Spark plug is fouled out and not creating a strong enough spark to ignite...

P0300, P0303, P1313, and P1314 codes are read on the scanner.

Hi there. The codes p0300 (https://www.yourmechanic.com/article/p0300-obd-ii-trouble-code-random-multiple-cylinder-misfire-detected-by-jamahl-walker) and p0303 (https://www.yourmechanic.com/article/p0303-obd-ii-trouble-code-cylinder-3-misfire-detected-by-spencer-clayton_2) are for the engine having a misfire. P0300 is for a random misfire where p0303 says that cylinder 3 had a misfire all the time. The code p1314 (http://obdii.pro/en/code/P1313) means that...

p0303, p1313, p0420. codes come up. no flashing and now signs. what do I do?

Hi there. Sounds like there are a few things going on. First the code P1313 (http://obdii.pro/en/code/P1313) means that the timing chain (https://www.yourmechanic.com/services/timing-chain-replacement) has jumped a tooth making the camshaft and crankshaft out of sync. The chain tensioner may need replaced...

Engine came back on after getting spark plugs and wires replaced.

Hello. If there are no physical symptoms, it will probably be necessary to rescan the computer and pull the fault codes (https://www.yourmechanic.com/article/how-to-read-and-understand-check-engine-light-codes-by-jason-unrau). A Check Engine Light (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) can literally signal any of hundreds of possible problems. The codes will at...

cold rough idle and P0303 code , run great after clearing code and warming up,

Code P0303 (https://www.yourmechanic.com/article/p0303-obd-ii-trouble-code-cylinder-3-misfire-detected-by-spencer-clayton_2) suggests a misfire in cylinder #3. This can happen for many reasons such as a vacuum leak (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-vacuum-leak), weak fuel pump (https://www.yourmechanic.com/services/fuel-pump-replacement) (pressure), bad ignition coil (https://www.yourmechanic.com/services/ignition-coil-replacement), low voltage to the fuel injectors (https://www.yourmechanic.com/services/fuel-injector-replacement) (causing pulse problems)...

codes p0101 and p0303 simultaneously

The code P0101 (https://www.yourmechanic.com/article/-p0101-obd-ii-trouble-code-mass-airflow-maf-circuit-operating-range-or-performance-problem-by-john-nelson) is for a problem with the MAF sensor and code P0303 (https://www.yourmechanic.com/article/p0303-obd-ii-trouble-code-cylinder-3-misfire-detected-by-spencer-clayton_2) is for a cylinder number 3 misfire. The first thing to check is to make sure there is no vacuum leaks or leaks between...

Stalling issues, error codes

Hello. The P0442 (https://www.yourmechanic.com/article/p0442-obd-ii-trouble-code-evaporative-emission-control-system-leak-detected-small-leak-by-spencer-clayton) error code is an evaporative emission control (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-evaporative-emission-control-canister) code and is an indication of a small leak being detected in the evaporative emission system. There are usually no visible symptoms of this error code, other than...

Getting code P0303

If you have already taken the first step of getting your codes scanned, the next thing to do would be to have an ignition test performed by a qualified technician. Attempting to do this yourself could result in being shocked...

Cylinder 3 is misfiring

Misfire on cylinder 3 usually mean you have a bad spark plug or spark plug wire. If you haven't had a tune up in a while I would recommend having a technician, such as one from YourMechanic, come out and...

hey Jay. I have a vw jetta 2011 4 cyl. my car has 60,000 miles was driving and felt a slight hesitation when accelerating uphill.

Diagnostic Trouble Code P0303 (https://www.yourmechanic.com/article/p0303-obd-ii-trouble-code-cylinder-3-misfire-detected-by-spencer-clayton_2) means that Cylinder No. 3 is misfiring but the causes of that misfiring can be very varied. The other Code that you probably saw, namely P0304, just refers to the same misfiring but it is...

Idle Problem/Engine Misfire Code P0300 P0301 P0303

Hi there. Check the spark plugs and fuel injectors for cylinder 1 and cylinder 3. Both cylinders are misfiring. If the plugs are good and the fuel injectors are firing, then there could be a problem with the internals of...

My truck has a violent shake, rapid onset, massive white smoke, increases shaking with turbo charger pressure increase, and has an error code of p0303.

Hi there. If you are having a misfire on cylinder number 3 and the injectors are new with the fuel lines cleaned out, then the exhaust valve is burned on cylinder number 3 and needs replaced. This is why there...

Car idles and multiple trouble codes are triggered

Hi there. If this vehicle is having an idle concern, I have to ask if you may be having a stumble or stall issue when coming to a stop. If so, your vehicle may be covered under a special service...

Fuel injection issue - 2005 Buick LaCrosse

Hi there. Your vehicle has a sequential fuel injection system. When the computer detects a fault, it converts to port fuel injection (bank to bank/limp mode). The most likely cause could be an electrical short in the odd bank of...

Vehicle runs roughly, shudders and rattles, vacuum leak

Thanks for writing in about your 2000 Chrysler Cirrus. When the coils were removed to replace the spark plugs, they should have been inspected for oil getting on them from a leaking valve cover. The leaking valve cover may leak...

Don't understand CEL Codes.

The codes P0300 through P0306 are for misfires of random cylinders or different cylinders. The second code P1456 is for the evaporative fuel tank system having a leak somewhere in the system (https://www.yourmechanic.com/article/how-to-diagnose-a-fluid-leak-by-mark-vallet). Since you are getting random misfires, then...

Code P0303 cylinder 3 misfire

The symptoms you describe along with the blinking Check Engine Light and P0303 trouble code definitely tell us that you have a misfire in cylinder number 3 (https://www.yourmechanic.com/article/p0303-obd-ii-trouble-code-cylinder-3-misfire-detected-by-spencer-clayton_2). Your engine uses a coil on plug system. This means each individual...

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