Trouble codes › P0325
P0325 Knock Sensor 1 Circuit (Bank 1 or Single Sensor)
Ignition and misfire
P0325 means the engine computer isn't getting a usable signal from knock sensor 1, so it retards timing to be safe.
The knock sensor listens for engine knock (pinging) so the engine computer can retard the spark timing. P0325 means the computer isn't getting a usable signal from knock sensor 1, so it usually retards timing to be safe.
Usually drivable, but the engine may feel sluggish and use more fuel. Avoid heavy loads, and stop if you hear knocking.
Common causes
- Damaged wiring or a corroded connector (sensors often sit under the intake manifold)
- A failed knock sensor
- A sensor not tightened to the correct torque
- Water or corrosion in the harness under the intake (common on some engines)
Symptoms
- Check-engine light
- Reduced power or worse fuel economy
- Sometimes no noticeable change
What to check first
- Inspect the knock sensor wiring and connector you can reach; on some engines the harness under the intake is a known failure point.
- Measure the sensor's resistance or output as your service information describes.
- Check for service bulletins: some engines have updated knock sensor harnesses.
- If the sensor is replaced, tighten it to the specified torque: too loose or too tight changes its reading.
What does P0325 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
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Related codes
General guidance for P0325 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.