What does code P0325 mean on a Lexus and is it safe to drive?
P0325: Knock Sensor 1 Circuit Malfunction (Bank 1). Here's what it means on your Lexus, 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 Lexus
- 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 Lexus, 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 Lexus
Lexus P0325 on 3.5L V6 (2GR-FE, 2GR-FSE)—the knock sensor is mounted under the intake manifold and requires manifold removal to access. The sensor itself is reliable; P0325 most often traces to the wiring harness connector corroding or chafing against the intake runner. On IS250 2.5L 4GR-FSE with direct injection, carbon buildup on intake valves changes combustion characteristics; after an intake valve cleaning, verify P0325 does not return from changed timing behavior. On high-performance IS-F 5.0L 2UR-GSE, knock sensor functionality is critical—do not defer this repair.
Most commonly affected models