System: Ignition & Misfire · Standard: SAE J2012 generic code · Severity: Low urgency
No immediate safety risk. Monitor it and fix it at the next service, but do not ignore it indefinitely.
Without knock feedback the controller retards ignition timing to protect the engine, which costs power and economy.
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 knock sensor circuit is not returning a plausible signal. Knock Sensor 1 Circuit Malfunction is a generic ignition & misfire code defined by SAE J2012, so it carries the same meaning on every OBD-II vehicle.
Low urgency. No immediate safety risk. Monitor it and fix it at the next service, but do not ignore it indefinitely.
In rough order of how often they turn out to be the problem: Failed knock sensor; Wiring fault; Loose sensor mounting.
P0300 Random or Multiple Cylinder Misfire DetectedP0301 Cylinder 1 Misfire DetectedP0302 Cylinder 2 Misfire DetectedP0303 Cylinder 3 Misfire DetectedP0304 Cylinder 4 Misfire DetectedP0305 Cylinder 5 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.