What does code P0325 mean on a Ford and is it safe to drive?
P0325: Knock Sensor 1 Circuit Malfunction (Bank 1). Here's what it means on your Ford, 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 Ford
- 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 Ford, 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 Ford
Ford P0325 on Modular V8 engines (4.6, 5.4) is commonly a wiring harness issue rather than sensor failure—the knock sensor harness routes near the exhaust manifold and the sheathing deteriorates from heat. Inspect the harness between the sensor and PCM connector for damage before replacing the sensor. On EcoBoost engines (3.5T, 2.0T), P0325 is uncommon and usually indicates genuine sensor failure or a loose sensor mounting bolt—the sensor must be torqued to spec (15–20 Nm) to read correctly.
Most commonly affected models