There are several possible causes for a P0303 code, including:
* A bad spark plug
* A bad spark plug wire
* A bad ignition coil
* A bad fuel injector
* A faulty oxygen sensor
* A vacuum leak
* A low compression
If you are experiencing a P0303 code, it is important to have your vehicle diagnosed by a qualified mechanic to determine the cause of the problem and to have it repaired.
Here are some additional symptoms that may accompany a P0303 code:
* Rough idle
* Engine hesitation
* Stalling
* Loss of power
* Check engine light on