P0325 Ford Ranger
Knock Sensor 1 Circuit Malfunction (Bank 1) · Powertrain Code · Medium · Repair: Moderate
What is P0325?
The knock sensor 1 on bank 1 is not functioning properly. The ECM cannot detect engine knock/detonation.
When the Ford Ranger triggers code P0325 (knock sensor 1 circuit malfunction (bank 1)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Ford Ranger.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford Ranger.
Common Causes on Ford Ranger
- Failed knock sensor (bank 1) — heat cycling degrades the sensor over time
- Corroded knock sensor connector or wiring
- Knock sensor not torqued to spec after previous service
- Engine mechanical noise being misinterpreted as knock
Symptoms
- Check engine light
- Reduced engine performance (PCM retards timing as a safety measure)
- Slightly lower fuel economy
- No audible symptom in most cases
Notes for Ford Ranger
Knock sensors on Ford V6 and V8 engines are buried under the intake manifold — the part is cheap but labor is significant.