OBD-II code · Powertrain (generic)
P0325 Knock Sensor 1 Circuit Malfunction (Bank 1)
A general fault has been detected in the bank 1 knock sensor circuit. The ECU uses the knock sensor to detect pre-ignition and retards ignition timing when knock occurs; with no signal, the ECU runs conservative timing and loses power.
Is it safe to drive with P0325?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyKnock sensor failed
- PossibleSensor mounting bolt loose (sensor must be torqued correctly)
- Less likelyWiring fault
Symptoms
- Check engine light on
- Power loss from defensive spark retard
- Increased fuel consumption
- Possible audible pinging under load
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1.5–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Knock Sensor, Knock Sensor Wiring
Related codes
- P0322Ignition/Distributor Engine Speed Input Circuit No Signal
- P0323Ignition/Distributor Engine Speed Input Circuit Intermittent
- P0324Knock/Combustion Vibration Control System Error
- P0326Knock/Combustion Vibration Sensor A Circuit Range/Performance
- P0327Knock Sensor 1 Circuit Low Input (Bank 1)
- P0328Knock Sensor 1 Circuit High Input (Bank 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.