Knock Sensor 1 Circuit, Bank 1 or Single Sensor
Knock sensor 1 helps the computer recognize combustion vibration and manage ignition timing. P0325 indicates a circuit or functional monitoring fault, not proof of actual engine knock. Bank 1 means the side containing cylinder 1, or the single-sensor application where specified. Wiring, sensor mounting and the sensor itself need vehicle-specific checks before any replacement decision.
Can I keep driving?
Loud metallic knocking, an oil-pressure warning, overheating or unsafe power loss calls for a safe stop and towing. With a steady light and no symptoms, get shop guidance before further driving and avoid heavy load or hard acceleration.
What does this code mean for your car?
The same code can need different checks depending on the model and engine. Enter your vehicle details to find relevant sources and checks.
Symptoms
- Engine warning with no noticeable change
- Reduced acceleration response
- Possible knocking noise requiring separate assessment
Possible causes
- 1Open, short or damaged connector in sensor 1 circuit
- 2Faulty knock sensor
- 3Incorrect sensor mounting or contact
- 4Signal interference or engine control fault
These possibilities are not ranked by frequency and do not diagnose your vehicle.
Checks you can safely do yourself
Safe checks only: engine off and cold, car on level ground.
- Save the code and freeze-frame data if your scanner offers them, without clearing anything.
- Note recent fuel used and any noise already observed; do not load the engine to provoke knocking.
When you need a shop
Request wiring, signal and mounting checks using the specified torque and test method. Loud metallic knocking or an oil-pressure warning requires stopping and towing; do not assume noise comes only from a sensor fault.
How much does it cost?
A US repair estimate needs a diagnosis and a local shop quote.
No verified US repair quote is available for this fault. The price depends on diagnosis, vehicle, parts and local labor; request 2-3 itemized quotes.
Get 2-3 quotes
Investigate this code for my carFAQ
Can I keep driving with P0325?
Loud metallic knocking, an oil-pressure warning, overheating or unsafe power loss calls for a safe stop and towing. With a steady light and no symptoms, get shop guidance before further driving and avoid heavy load or hard acceleration.
What can cause P0325?
Possible causes include open, short or damaged connector in sensor 1 circuit; faulty knock sensor; incorrect sensor mounting or contact; signal interference or engine control fault. These are diagnostic possibilities, not a confirmed diagnosis or a parts shopping list.
Does clearing the code fix the problem?
No. Clearing a code does not repair the problem or prove that no fault exists. It may erase useful evidence and reset readiness monitors. Save codes and freeze-frame data first; confirming a repair requires the vehicle-specific checks.
What if this code appears during a used-car inspection?
Arrange an independent professional pre-purchase inspection before committing. Request a complete scan, readiness status and diagnosis of the relevant system. Get written findings and a repair estimate; an unlit warning lamp does not replace inspection.
How much does a P0325 repair cost?
No verified US repair quote is available for this fault. The price depends on diagnosis, vehicle, parts and local labor; request 2-3 itemized quotes.