P0325: Knock Sensor Circuit (Bank 1)
GarageDex's OBD-II reference explains that code P0325 means "Knock Sensor Circuit (Bank 1)" - A fault in the knock sensor circuit - the sensor that listens for detonation so the computer can pull timing to protect the engine.
Moderate - drivable, but don't put it off
Drivable; the computer runs conservative timing, so expect slightly less power until fixed.
Symptoms
- Check-engine light
- Possible reduced power/economy
- Occasional pinging under load
Common causes (most to least likely)
- Failed knock sensor
- Wiring/connector fault
- Corrosion at the sensor
How to fix P0325
- Inspect wiring and connector
- Replace the knock sensor (often under the intake)
Guidance only - confirm the cause with a scan before replacing parts. Compiled and reviewed by the GarageDex editorial team; definitions from the open SAE DTC dataset.
Tools & parts for P0325
Confirm the cause before you buy anything - a code points to a system, not a guaranteed part. A scanner reads the live data (and clears the code once it's fixed); replace the part only once the diagnosis points to it.
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Frequently asked
What does the P0325 code mean?
GarageDex's OBD-II reference explains that code P0325 means "Knock Sensor Circuit (Bank 1)" - A fault in the knock sensor circuit - the sensor that listens for detonation so the computer can pull timing to protect the engine.
What are the symptoms of P0325?
Common symptoms: Check-engine light; Possible reduced power/economy; Occasional pinging under load.
What causes a P0325 code?
The common causes, most to least likely: Failed knock sensor; Wiring/connector fault; Corrosion at the sensor.
Is it safe to drive with a P0325 code?
Drivable; the computer runs conservative timing, so expect slightly less power until fixed.
How do I fix a P0325 code?
Inspect wiring and connector Replace the knock sensor (often under the intake) Confirm the cause with a scan before replacing parts.