Knock sensor 1 circuit (Bank 1)
What P0325 means
Your car's computer set P0325: Knock sensor 1 circuit (Bank 1). It belongs to the ignition system and misfire group of codes. It is a generic code, so it means the same thing on every make. The check engine light usually comes on once the fault has been seen on two drives in a row. Until then it shows up as a pending code.
Can I keep driving? Usually safe to drive for now, but get it checked soon. Left alone it can lower fuel economy, fail an emissions test or lead to a bigger repair.
Common causes
- Failed knock sensor
- Damaged wiring (often under the intake manifold)
- Real engine knock from low-octane fuel or carbon build-up
Fix the cheapest, most likely cause first. Clearing the code without a repair only turns the light off until the fault comes back.
Check it yourself
Watch timing advance on the Graph tab. If it keeps dropping under load, the computer is pulling timing to protect the engine.
Torque Deck reads P0325 with a cheap Bluetooth OBD2 adapter. It also shows the freeze frame (engine conditions at the moment the code set) and the live data you need to narrow it down.
Parts
Parts most often replaced for P0325: knock sensor. Confirm the cause first, and match the part to your exact engine.
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Related codes
This page explains what the code usually means. It is not a diagnosis of your car. When in doubt, ask a mechanic.