P0325: Knock Sensor 1 Circuit Malfunction
Severity: medium
What it means: The engine computer sees a problem in the knock sensor 1 circuit (bank 1).
Safe to drive? Usually drivable. The computer may retard timing and reduce power. Avoid hard loads.
Common symptoms
- Check-engine light
- Reduced power or worse fuel economy
- Pinging may go undetected
Likely causes, ranked
- Faulty knock sensorShop
- Wiring or connector damageDIY
- Actual engine knock or a loose sensor mountingShop
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What it means: The engine computer sees a problem in the knock sensor 1 circuit (bank 1).
Severity: Medium. Safe to drive? Usually drivable. The computer may retard timing and reduce power. Avoid hard loads.
DIY or shop?
Access varies. On some V engines the sensor sits under the intake manifold.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic if you notice drivability changes, warning lights or overheating. A code points to a circuit or system, not always a specific part.
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