2006 Toyota P0325: What It Means & Is It Safe to Drive?
P0325 on the 2006 Toyota: 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 2006 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 2006 Toyota, repairs for P0325 typically fall between $150 and $500, depending on the root cause and labor rates in your area.
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