What does code P0325 mean on a Toyota and is it safe to drive?
P0325: Knock Sensor 1 Circuit Malfunction (Bank 1). Here's what it means on your Toyota, 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 Toyota
- 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 Toyota, 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 Toyota
Toyota P0325 on the 3.4L 5VZ-FE V6 (Tacoma, 4Runner, Tundra) is one of the most well-known knock sensor failure patterns in the industry—Toyota issued a recall and extended warranty for this exact issue. The OEM sensor uses a flat washer-style design that cracks over time; replacement requires removing the intake manifold. Toyota upgraded to an improved sensor design. On 2AR-FE 2.5L engines, P0325 is less common but indicates sensor harness chafing against the timing cover.
Most commonly affected models