What does code P0325 mean on a Honda and is it safe to drive?
P0325: Knock Sensor 1 Circuit Malfunction (Bank 1). Here's what it means on your Honda, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
What this code means
The PCM isn't receiving a valid signal from knock sensor 1. Without knock feedback, the PCM retards ignition timing as a safety measure, reducing power and economy.
Common causes for your Honda
- Failed knock sensor
- Corroded or broken wiring/connector at the sensor
- Actual engine knock from carbon buildup or low-octane fuel
Symptoms
- Check Engine Light
- Reduced power and fuel economy (PCM retards timing)
- Possible audible knock or ping under load
Typical fixes
- Replace knock sensor
- Repair wiring and connector
- Use correct octane fuel and address carbon buildup
Repair cost range
For a Honda, repairs for P0325 often fall between $150 and $500, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Honda
Honda P0325 on J-series V6 engines (Accord, Pilot, Odyssey) is typically caused by the knock sensor connector corroding—the sensor itself rarely fails, but the two-pin connector at the top of the engine corrodes from moisture. Clean and re-pin the connector before replacing the sensor. On four-cylinder K-series engines, P0325 is less common; check the harness routing near the exhaust manifold heat shield where it can chafe.
Most commonly affected models