P0325 — Knock Sensor 1 Circuit (Bank 1)
Drive with caution — fix soon.
What P0325 means
P0325 indicates a fault in the Bank 1 knock sensor circuit. The knock sensor listens for engine knock (pinging) and lets the computer adjust timing to protect the engine. The cause is often a failed sensor, wiring issues, or a loose connector, and it's usually a manageable repair.
Common symptoms
- Check engine light is on
- Reduced engine power or performance
- Lower fuel economy
- Engine pinging or knocking sound under load
- Hesitation during acceleration
Common causes
- Failed knock sensor
- Damaged or corroded wiring to the sensor
- Loose or dirty sensor connector
- Engine knock from another underlying issue
- Incorrect sensor installation torque
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I drive with a P0325 code?
Usually yes for a while, but the engine loses some of its knock protection. To avoid long-term wear, have it fixed within a reasonable time.
How much does a P0325 repair cost?
Typically between $150 and $500. The sensor itself can be cheap, but on some engines it sits under the intake, which raises labor cost.
Is P0325 serious?
It's moderate. It won't usually strand you, but driving long-term without knock protection can risk engine damage if real knock occurs.
What is a knock sensor anyway?
It's a small sensor that detects engine vibration from abnormal combustion, letting the computer retard timing to keep the engine safe.