BMW Cars 1999-06

4.4L V8 - Auto 7

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Trouble Code: P1421



Secondary Air Injector Valve Circuit Short to Ground

Possible Causes:



Connector to the secondary air injection valve is loose or disconnected
 
Secondary air injector valve circuit short
 
Secondary air injector valve circuit is open
 
Faulty secondary air injector valve
 

Trouble Code: P1423



Secondary Air Pump Valve Plausibility

Possible Causes:



Connector to the secondary air injection valve is loose or disconnected
 
Secondary air injector valve circuit short
 
Secondary air injector valve circuit is open
 
Faulty secondary air injector valve
 

Trouble Code: P1432



Secondary Air Injection Valve Open

Possible Causes:



Fuel pump relays have failed
 
Fuel injector has failed
 
Hoses on the EVAP canister may be clogged
 
EVAP canister purge regulator valve may be faulty
 
DME may have failed
 
Manifold Tuning Valve (IMT) may have failed
 

Trouble Code: P1453



Secondary Air Injector Valve Circuit Electrical Malfunction (Disconnection)

Possible Causes:



Connector to the secondary air injection valve is loose or disconnected
 
Secondary air injector valve circuit short
 
Secondary air injector valve circuit is open
 
Faulty secondary air injector valve
 

Trouble Code: P1470



EVAP Emission Control LDP Circuit Electrical Malfunction

Possible Causes:



EVAP canister system has an improper or broken seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Leak Detection Pump (LDP) is faulty
 

Trouble Code: P1475



EVAP Emission Control LDP Circuit Malfunction/Signal Circuit Open

Possible Causes:



Leak Detection Pump has failed
 
EVAP canister system has an improper or broken seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Hoses between the fuel pump and the EVAP canister are faulty
 
Fuel filler cap is loose
 
Fuel pump seal is defective, faulty or otherwise leaking
 
Hoses between the EVAP canister and the fuel flap unit are faulty
 
Hoses between the EVAP canister and the evaporative emission canister purge regulator valve are faulty
 

Trouble Code: P1476



EVAP Emission Control LDP Circuit Malfunction/Insufficient Vacuum

Possible Causes:



Leak Detection Pump has failed
 
EVAP canister system has an improper or broken seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Hoses between the fuel pump and the EVAP canister are faulty
 
Fuel filler cap is loose
 
Fuel pump seal is defective, faulty or otherwise leaking
 
Hoses between the EVAP canister and the fuel flap unit are faulty
 
Hoses between the EVAP canister and the evaporative emission canister purge regulator valve are faulty
 

Trouble Code: P1500



Idle Air Control Valve Malfunction

Possible Causes:



Charge air system leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 

Trouble Code: P1501



Idle Air Control Valve Malfunction

Possible Causes:



Charge air system leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 

Trouble Code: P1502



Idle Air Control Valve Circuit Short to B+

Possible Causes:



Fuel delivery unit connector is loose or not attached
 
Fuse 18 cause a short to the transfer fuel pump or the O2S
 
Fuel pump has failed
 
Fuel pump relay circuit is shorted to ground, B+ or is open
 
Fuel Pump (FP) Relay not activated
 

Trouble Code: P1503



Idle Air Control Valve Circuit Short to Ground

Possible Causes:



Fuel delivery unit connector is loose or not attached
 
Fuse 18 cause a short to the transfer fuel pump or the O2S
 
Fuel pump has failed
 
Fuel pump relay circuit is shorted to ground, B+ or is open
 
Fuel Pump (FP) Relay not activated
 

Trouble Code: P1504



Idle Air Control Valve Circuit Continuity-Open Load

Possible Causes:



Fuel delivery unit connector is loose or not attached
 
Fuse 18 cause a short to the transfer fuel pump or the O2S
 
Fuel pump has failed
 
Fuel pump relay circuit is shorted to ground, B+ or is open
 
Fuel Pump (FP) Relay not activated
 

Trouble Code: P1506



Idle Air Control Valve Circuit Short to B+

Possible Causes:



Fuel delivery unit connector is loose or not attached
 
Fuse 18 cause a short to the transfer fuel pump or the O2S
 
Fuel pump has failed
 
Fuel pump relay circuit is shorted to ground, B+ or is open
 
Fuel Pump (FP) Relay not activated
 

Trouble Code: P1507



Idle Air Control Valve Circuit Short to Ground

Possible Causes:



Fuel delivery unit connector is loose or not attached
 
Fuse 18 cause a short to the transfer fuel pump or the O2S
 
Fuel pump has failed
 
Fuel pump relay circuit is shorted to ground, B+ or is open
 
Fuel Pump (FP) Relay not activated
 

Trouble Code: P1508



Idle Air Control Valve Circuit Continuity-Open Load

Possible Causes:



Fuel delivery unit connector is loose or not attached
 
Fuse 18 cause a short to the transfer fuel pump or the O2S
 
Fuel pump has failed
 
Fuel pump relay circuit is shorted to ground, B+ or is open
 
Fuel Pump (FP) Relay not activated
 

Trouble Code: P1509



Idle Air Control Valve

Possible Causes:



Charge air system leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 

Trouble Code: P1519



Engine Oil Quality Sensor Temperature Measurement

Possible Causes:



Replace the oil temperature sensor
 

Trouble Code: P1521



Intake Camshaft Control (Bank 2) Malfunction

Possible Causes:



Camshaft control circuit is open or shorted to ground
 
Camshaft sensor is damaged or the DME has failed
 
Camshaft out of adjustment
 

Trouble Code: P1522



Intake Camshaft Control (Bank 2) Malfunction

Possible Causes:



Camshaft control circuit is open or shorted to ground
 
Camshaft sensor is damaged or the DME has failed
 
Camshaft out of adjustment
 

Trouble Code: P1526



Camshaft Control Circuit Ground

Possible Causes:



Fuel pump has failed
 
CPS circuit is open, shorted to ground or shorted to power
 
Battery voltage below 11.5 volts
 
Position actuator circuit may short to B+ or Ground
 
Camshaft timing improperly set, or continuous oil flow to the VCT piston chamber
 
Camshaft advance mechanism (the VCT unit) is sticking or binding mechanically
 
VCT solenoid valve is stuck in open position
 

Trouble Code: P1527



Variable Camshaft Timing (VANOS) Circuit Malfunction

Possible Causes:



Replace the sensor
 

Trouble Code: P1550



Idle Air Control Valve

Possible Causes:



Charge air system leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 

Trouble Code: P1734



Pressure Control Valve 2 Electrical

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1738



Pressure Control Valve 3 Electrical

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1740



Clutch Solenoid Circuit Range/Performance

Possible Causes:



Short to battery
 
Short to ground
 
Open circuit
 

Trouble Code: P1743



Pressure Regulator Valve 5 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1745



Pressure Regulator Valve 5 Plausibility

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1750



Shift Solenoid Power Supply Malfunction

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1753



Pressure Regulator Valve 4 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1758



Shift Solenoid B

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1763



Shift Solenoid C Short to Ground

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1831



Pressure Regulator Valve 1 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1832



Pressure Regulator Valve 2 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1833



Pressure Regulator Valve 3 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1834



Pressure Regulator Valve 4 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1835



Pressure Regulator Valve 5 Upper Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1841



Pressure Regulator Valve 1 Lower Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1842



Pressure Regulator Valve 2 Lower Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1843



Pressure Regulator Valve 3 Lower Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

Trouble Code: P1844



Pressure Regulator Valve 4 Lower Threshold

Possible Causes:



Pressure control solenoid circuit is shorting to ground
 
Pressure control solenoid circuit is open
 
Valve has failed
 
TCM has failed
 

 
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