System: Ignition & Misfire · Standard: SAE J2012 generic code · Severity: Do not keep driving
This fault can damage expensive hardware within a short distance. Stop and diagnose before driving further.
Swap the coil and plug to another cylinder. If the misfire follows them, the parts are at fault; if it stays on cylinder 1, look at compression and injection.
Start by reading every stored and pending code, not just this one. A single fault frequently sets three or four codes at once, and the first one in the freeze-frame data is usually the cause while the rest are consequences.
The controller has identified repeated misfires on cylinder 1. Cylinder 1 Misfire Detected is a generic ignition & misfire code defined by SAE J2012, so it carries the same meaning on every OBD-II vehicle.
Do not keep driving. This fault can damage expensive hardware within a short distance. Stop and diagnose before driving further.
In rough order of how often they turn out to be the problem: Failed spark plug on cylinder 1; Failed ignition coil; Faulty injector.
P0300 Random or Multiple Cylinder Misfire DetectedP0302 Cylinder 2 Misfire DetectedP0303 Cylinder 3 Misfire DetectedP0304 Cylinder 4 Misfire DetectedP0305 Cylinder 5 Misfire DetectedP0306 Cylinder 6 Misfire DetectedCode number, system and definition follow the SAE J2012 / ISO 15031-6 generic diagnostic trouble code standard. Symptoms, causes and severity are the standard generic diagnostic logic for that fault. This page does not contain manufacturer-specific procedures, part numbers or pricing.