MotorBitP0325: Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
Knock sensor circuit fault. The PCM may retard timing as a precaution, costing power.
Educational OBD2 information. Confirm on your vehicle with a scan tool. MotorBit can read this code, freeze frame, and live data over an ELM327 adapter.
What P0325 means
The knock sensor signal is missing or out of range.
Why the check engine light comes on
Without knock detection the PCM cannot safely optimize timing, so the MIL is set.
Common causes
- Failed knock sensor
- Wiring near the block
- Connector oil contamination
- Wrong torque on sensor
Typical symptoms
- MIL
- Possible power loss
- Ping if the sensor was actually failing closed
What to do next
- Inspect the connector on the engine block.
- Do not overtighten a new sensor.
- Clear and verify with a road test after repair.
How MotorBit helps
Open MotorBit, connect your ELM327, and read P0325 with freeze frame (RPM, load, temperature, speed at the moment the fault set). Then watch live PIDs and fuel trims instead of replacing parts by guesswork. When the repair is verified, clear the code and re-check monitors.
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FAQ
Is P0325 serious?
Severity is listed as medium on this page. Misfire, crank/cam, and communication codes deserve faster attention than a tiny EVAP leak.
Will disconnecting the battery clear P0325?
It may hide the lamp temporarily, but the fault usually returns and you lose freeze-frame evidence. Scan first, then clear after the repair.
Can MotorBit clear P0325?
Yes, after you understand the cause. Clearing without a repair is how the light comes back on the next drive cycle.