2021 Lexus P0325: What It Means & Is It Safe to Drive?
P0325 on the 2021 Lexus: Knock Sensor 1 Circuit Malfunction (Bank 1). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe 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 on the 2021 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 2021 Lexus, repairs for P0325 typically fall between $150 and $500, depending on the root cause and labor rates in your area.
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