P0325moderate severityPowertrain
Knock Sensor 1 Circuit Bank 1
on 1998 Subaru Impreza 2.5L H4 · AWD
What this code means
Malfunction in the knock sensor 1 circuit for Bank 1. The knock sensor detects engine detonation/pinging and allows the PCM to retard timing.
Symptoms
- Check Engine Light
- Reduced power (timing retarded)
- Possible pinging/knocking
- Poor fuel economy
Common causes
- Faulty knock sensor
- Wiring damage
- Incorrect torque on sensor
- PCM failure
- Engine noise masking knock signal
Diagnostic steps
- Test knock sensor resistance
- Inspect wiring and connector
- Check sensor mounting torque
- Monitor knock signal with scan tool
Repair notes
Replace knock sensor. Torque to spec (important). Use correct sensor for application.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1