If you have an engine misfire, which will feel like a rough idle or rough running engine while driving, and a check engine light for trouble code P0303, it means there is an issue with cylinder 3 on your engine. This article explains what to do and how to fix this problem if you’re experiencing it.
You may go to start your car and see the check engine light is on and the engine is running rough. After grabbing and connecting your handy OBD II scan tool or code reader, you find out you have a P0171 code. We’ll review what this code means, how serious it is, and how to diagnose it yourself.
Watch this video for expert mechanic help diagnosing P0171 code causes, and keep reading for more details:
When diagnosing a problem with the ignition, the first thing to note is that the ignition fault codes in your powertrain control module (PCM) are not related to the ignition key. Ignition fault codes are related to the air and fuel mixture inside your engine not combusting properly.
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