Ask Andy AIP0325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
What it means, what causes it, and what it costs to fix.
What P0325 means
The knock sensor listens for detonation (pinging) so the computer can adjust spark timing. Its circuit is reading out of range, so the computer can't trust it.
Can I drive with P0325?
Severity: Medium. Fix soon so it doesn't turn into something bigger.
Usually drivable. The computer retards timing to be safe, so you'll lose some power and mileage. Use the recommended octane.
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Ask Andy about P0325Symptoms
- Reduced power
- Worse fuel economy
- Pinging under load (in some cases)
- Check engine light
Common causes
Most likely first.
- Failed knock sensor
- Damaged wiring or connector (often under the intake manifold)
- Sensor not torqued correctly
How to diagnose P0325
- Inspect the connector and harness. On many V6/V8 engines it sits under the intake manifold and corrodes.
- Measure sensor resistance or voltage as specified.
- Check for TSBs on knock sensor harnesses for your engine.
Tip: most US auto parts stores will read your codes for free.
Repair costs
| Knock sensor (easy access) | $150–$350 installed |
| Knock sensor (under intake manifold) | $400–$900 installed |
Typical US prices. Your vehicle, region, and shop rates will change these.
P0325 FAQ
What does P0325 mean?
P0325 means "Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)." The knock sensor listens for detonation (pinging) so the computer can adjust spark timing. Its circuit is reading out of range, so the computer can't trust it.
Can I drive with a P0325 code?
Usually drivable. The computer retards timing to be safe, so you'll lose some power and mileage. Use the recommended octane.
What is the most common cause of P0325?
The most common cause is: Failed knock sensor. Other causes include damaged wiring or connector and sensor not torqued correctly.
How much does it cost to fix P0325?
Typical repairs run about $150 to $900 in the US, depending on the cause. Knock sensor (easy access): $150–$350 installed.
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