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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 may be seen with other misfire codes as well...

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Stalling issues, error codes
Hello. The P0442 error code is an evaporative emission control 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 the check...
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. Your engine uses a coil on plug system. This means each individual...
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...
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. Since you are getting random misfires, then I...
codes p0101 and p0303 simultaneously
The code P0101 is for a problem with the MAF sensor and code P0303 is for a cylinder number 3 misfire. The first thing to check is to make sure there is no vacuum leaks or leaks between the MAF...
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. A Check Engine Light can literally signal any of hundreds of possible problems. The codes will at least give...
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...
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...
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...
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 and plugs should be replaced first and...
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...
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...
cold rough idle and P0303 code , run great after clearing code and warming up,
Code P0303 suggests a misfire in cylinder #3. This can happen for many reasons such as a vacuum leak, weak fuel pump (pressure), bad ignition coil, low voltage to the fuel injectors (causing pulse problems) or a faulty mass air...

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