What Does P0300 Mean? Regarding the P0300 code, it would probably be worthwhile to carefully inspect the wire harness near the intake manifold bracket. This is done most easily from below the car in the area near the oil filter. When you see P0300 engine fault code on your engine code reader this description will help you. engine code P0300P0300 fixobd P0300dtc P0300obd code P0300obd2 P0300P0300 car codediagnostic code P0300car code P0300check engine code P0300fehlercode P0300P0300 fiatcodigo P0300codigo falla P0300P0300 kody b??dówcodigo de falla P0300 What are the common causes of P0300 ? A large air leak at or near the number one oxygen sensor would also cause a lean mixture. Faulty IMRC actuator relay (if equipped) Dirty air cleaner element Damaged DPF How do you troubleshoot P0300 ? Replacing damaged spark plugs Replacing damaged or worn spark plug wires and/or coils Repairing or replacing clogged EGR valves and/or tubes Repairing vacuum leaks Repairing or replacing leaking head gaskets Replacing faulty camshaft sensor Replacing faulty crankshaft sensor Replacing faulty mass air flow sensor Replacing faulty oxygen sensor Replacing faulty throttle position sensor Replacing faulty fuel injectors Replacing faulty catalytic converter Diagnosing and repairing other related trouble codes Replacing distributor cap and rotor button, as well as wires, coils, and plugs, (only if applicable to the vehicle) If necessary, repair fault internal engine components. Replacing engine (if cylinder damage exists) Replacing a faulty PCM Searches related to P0300 - Cylinder Misfire Detected Random Cylinders p0300 code chevy silverado p0300 gmc p0300 nissan p0300 dodge p0300 toyota p0300 chevrolet p0300 code dodge p0300 ford