P1396high severityPowertrain
Camshaft Position Sensor B Circuit Bank 1
on 2004 BMW 325i 2.5L I6 M54 · RWD
What this code means
The DME detected a malfunction in the exhaust camshaft position sensor (Sensor B) circuit on Bank 1. This sensor provides critical timing feedback to the DME for fuel injection and ignition timing.
Symptoms
- Check Engine Light
- Rough running
- Loss of power
- Engine may not start
- VANOS malfunction
Common causes
- Faulty camshaft position sensor Bank 1 exhaust
- Damaged sensor wiring or connector
- Sensor mounting bolt loose or missing
- Tone wheel damage or contamination
- DME internal circuit fault
Diagnostic steps
- Test camshaft position sensor signal with oscilloscope
- Inspect wiring and connector for damage
- Check sensor air gap and mounting
- Inspect tone wheel for debris or damage
- Compare sensor readings Bank 1 vs Bank 2
Repair notes
Replace the exhaust camshaft position sensor on Bank 1.
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