If you have code P0301, 2, 3, etc. misfire codes read my advice and diagnostic info below.

If your car has one of these codes you need to get it fixed asap. If you choose to drive your car in this condition you will do damage to the catalytic converter. Driving with a misfire causes unburned fuel to be put into the exhaust (because there is one or more cylinders that are not burning it like they should) which then is sent to the catalytic converter. It is not made to clean up exhaust with unburned fuel in it and will soon become faulty. This is an expensive repair so the best thing is just to get your car repaired!
The most common causes of this type of problem are:

Spark Plugs and Wires
Fuel Injectors
Internal Engine Problems such as Low Compression, etc.

Other things that might cause this code are:

Faulty Computer
Coil or Coil Packs
Crank or Cam sensors or reluctor wheels
Faulty O2 (Oxygen) Sensors

The first thing to do if you have this code is to inspect EVERYTHING that has to do with that specific cylinder. Since the misfire code is for that cylinder only it has to be only something that would affect that cylinder. This is the key to diagnosing this engine problem. You want to be looking at the spark plug, wire, coil and injector of that cylinder. You should also do a compression test and a leak down test to see if your piston rings or cylinder head valves are getting worn and causing low compression. A good way to check the plugs, wires and fuel injectors is to switch them with different cylinders to see if the misfire moves with them.




Leave p0301 and go to obd codes

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