P0412low severityPowertrain
Secondary Air Injection System Switching Valve A Circuit
on 2002 BMW 540iT E39 4.4L V8 M62 Touring · RWD
What this code means
Malfunction in the AIR switching valve circuit.
Symptoms
- Check Engine Light
- AIR system not functioning
Common causes
- Faulty switching valve
- Wiring issue
- Relay failure
Diagnostic steps
- Test valve solenoid
- Check wiring
- Test relay
Repair notes
Replace switching valve or repair wiring.
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