BMW Cars 1999-06

2.5L L6 - Auto 3

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Trouble Code: P0271



Cylinder 4 Injector Circuit Low Input/Short to B+

Possible Causes:



Injector control circuit is open
 
Injector power circuit (B+) is open
 
Injector control circuit is shorted to chassis ground
 
Injector is damaged or has failed
 
DME is not connected or has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 
Faulty engine speed sensor
 

Trouble Code: P0273



Cylinder 5 Injector Circuit Low Input/Short to Ground

Possible Causes:



Injector control circuit is open
 
Injector power circuit (B+) is open
 
Injector control circuit is shorted to chassis ground
 
Injector is damaged or has failed
 
DME is not connected or has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 
Faulty engine speed sensor
 

Trouble Code: P0274



Cylinder 5 Injector Circuit Low Input/Short to B+

Possible Causes:



Injector control circuit is open
 
Injector power circuit (B+) is open
 
Injector control circuit is shorted to chassis ground
 
Injector is damaged or has failed
 
DME is not connected or has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 
Faulty engine speed sensor
 

Trouble Code: P0276



Cylinder 6 Injector Circuit Low Input/Short to Ground

Possible Causes:



Injector control circuit is open
 
Injector power circuit (B+) is open
 
Injector control circuit is shorted to chassis ground
 
Injector is damaged or has failed
 
DME is not connected or has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 
Faulty engine speed sensor
 

Trouble Code: P0277



Cylinder 6 Injector Circuit Low Input/Short to B+

Possible Causes:



Injector control circuit is open
 
Injector power circuit (B+) is open
 
Injector control circuit is shorted to chassis ground
 
Injector is damaged or has failed
 
DME is not connected or has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 
Faulty engine speed sensor
 

Trouble Code: P0300



Random/Multiple Misfire Detected

Possible Causes:



Fuel metering fault that affects two or more cylinders
 
Fuel pressure too low or too high, fuel supply contaminated
 
EVAP system problem or the EVAP canister is fuel saturated
 
EGR valve is stuck open or the PCV system has a vacuum leak
 
Ignition system fault (coil, plugs) affecting two or more cylinders
 
MAF sensor contamination (it can cause a very lean condition)
 
Vehicle driven while very low on fuel (less than 1/8 of a tank)
 

Trouble Code: P0301



Cylinder Number 1 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or DME system
 
Base engine mechanical problem
 
Fuel delivery component problem (i.e., a contaminated, dirty or sticking fuel injector)
 
Fuel pump relay defective
 
Ignition coil fuses have failed
 
Ignition system problem (dirty damaged coil or plug)
 
Engine speed (RPM) sensor has failed
 
Camshaft position sensors have failed
 
Ignition coil is faulty
 
Spark plugs are not working properly or are not gapped properly
 

Trouble Code: P0302



Cylinder Number 2 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or DME system
 
Base engine mechanical problem
 
Fuel delivery component problem (i.e., a contaminated, dirty or sticking fuel injector)
 
Fuel pump relay defective
 
Ignition coil fuses have failed
 
Ignition system problem (dirty damaged coil or plug)
 
Engine speed (RPM) sensor has failed
 
Camshaft position sensors have failed
 
Ignition coil is faulty
 
Spark plugs are not working properly or are not gapped properly
 

Trouble Code: P0303



Cylinder Number 3 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or DME system
 
Base engine mechanical problem
 
Fuel delivery component problem (i.e., a contaminated, dirty or sticking fuel injector)
 
Fuel pump relay defective
 
Ignition coil fuses have failed
 
Ignition system problem (dirty damaged coil or plug)
 
Engine speed (RPM) sensor has failed
 
Camshaft position sensors have failed
 
Ignition coil is faulty
 
Spark plugs are not working properly or are not gapped properly
 

Trouble Code: P0304



Cylinder Number 4 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or DME system
 
Base engine mechanical problem
 
Fuel delivery component problem (i.e., a contaminated, dirty or sticking fuel injector)
 
Fuel pump relay defective
 
Ignition coil fuses have failed
 
Ignition system problem (dirty damaged coil or plug)
 
Engine speed (RPM) sensor has failed
 
Camshaft position sensors have failed
 
Ignition coil is faulty
 
Spark plugs are not working properly or are not gapped properly
 

Trouble Code: P0305



Cylinder Number 5 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or DME system
 
Base engine mechanical problem
 
Fuel delivery component problem (i.e., a contaminated, dirty or sticking fuel injector)
 
Fuel pump relay defective
 
Ignition coil fuses have failed
 
Ignition system problem (dirty damaged coil or plug)
 
Engine speed (RPM) sensor has failed
 
Camshaft position sensors have failed
 
Ignition coil is faulty
 
Spark plugs are not working properly or are not gapped properly
 

Trouble Code: P0306



Cylinder Number 6 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or DME system
 
Base engine mechanical problem
 
Fuel delivery component problem (i.e., a contaminated, dirty or sticking fuel injector)
 
Fuel pump relay defective
 
Ignition coil fuses have failed
 
Ignition system problem (dirty damaged coil or plug)
 
Engine speed (RPM) sensor has failed
 
Camshaft position sensors have failed
 
Ignition coil is faulty
 
Spark plugs are not working properly or are not gapped properly
 

Trouble Code: P0307



Cylinder Number 7 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or DME system
 
Base engine mechanical problem
 
Fuel delivery component problem (i.e., a contaminated, dirty or sticking fuel injector)
 
Fuel pump relay defective
 
Ignition coil fuses have failed
 
Ignition system problem (dirty damaged coil or plug)
 
Engine speed (RPM) sensor has failed
 
Camshaft position sensors have failed
 
Ignition coil is faulty
 
Spark plugs are not working properly or are not gapped properly
 

Trouble Code: P0308



Cylinder Number 8 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or DME system
 
Base engine mechanical problem
 
Fuel delivery component problem (i.e., a contaminated, dirty or sticking fuel injector)
 
Fuel pump relay defective
 
Ignition coil fuses have failed
 
Ignition system problem (dirty damaged coil or plug)
 
Engine speed (RPM) sensor has failed
 
Camshaft position sensors have failed
 
Ignition coil is faulty
 
Spark plugs are not working properly or are not gapped properly
 

Trouble Code: P0313



Misfire Detected with Low Fuel

Possible Causes:



Air leak in the intake manifold, or in the EGR or DME system
 
Base engine mechanical problem
 
Fuel delivery component problem (i.e., a contaminated, dirty or sticking fuel injector)
 
Fuel pump relay defective
 
Ignition coil fuses have failed
 
Ignition system problem (dirty damaged coil or plug)
 
Engine speed (RPM) sensor has failed
 
Camshaft position sensors have failed
 
Ignition coil is faulty
 
Spark plugs are not working properly or are not gapped properly
 

Trouble Code: P0325



Knock Sensor 1 Circuit Malfunction

Possible Causes:



Knock sensor circuit is open
 
Knock sensor is loose (tighten to 20 NM)
 
Contact between the knock sensor and cylinder block is dirty, corroded or greasy
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
Wrong kind of fuel used
 
A component in the engine compartment is loose or not properly secured
 

Trouble Code: P0327



Knock Sensor 1 Signal Low Input

Possible Causes:



Knock sensor circuit is open
 
Knock sensor is loose (tighten to 20 NM)
 
Contact between the knock sensor and cylinder block is dirty, corroded or greasy
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
Wrong kind of fuel used
 
A component in the engine compartment is loose or not properly secured
 

Trouble Code: P0328



Knock Sensor 1 Signal High Input

Possible Causes:



Knock sensor circuit is open
 
Knock sensor is loose (tighten to 20 NM)
 
Contact between the knock sensor and cylinder block is dirty, corroded or greasy
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
Wrong kind of fuel used
 
A component in the engine compartment is loose or not properly secured
 

Trouble Code: P0330



Knock Sensor 1 Circuit Malfunction

Possible Causes:



Knock sensor circuit is open
 
Knock sensor is loose (tighten to 20 NM)
 
Contact between the knock sensor and cylinder block is dirty, corroded or greasy
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
Wrong kind of fuel used
 
A component in the engine compartment is loose or not properly secured
 

Trouble Code: P0332



Knock Sensor 2 Signal Low Input

Possible Causes:



Knock sensor circuit is open
 
Knock sensor is loose (tighten to 20 NM)
 
Contact between the knock sensor and cylinder block is dirty, corroded or greasy
 
Knock sensor circuit is shorted to ground, or shorted to power
 
Knock sensor is damaged or it has failed
 
Wrong kind of fuel used
 
A component in the engine compartment is loose or not properly secured
 

Trouble Code: P0335



Camshaft Position Sensor -A- Circ Malfunction

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 

Trouble Code: P0339



Camshaft Position Sensor Circuit Malfunction

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 
CMP sensor has failed
 

Trouble Code: P0340



Camshaft Position Sensor Circuit Malfunction

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 
CMP sensor has failed
 

Trouble Code: P0344



Camshaft Position Sensor Circuit Malfunction

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 
CMP sensor has failed
 

Trouble Code: P0345



Camshaft Position Sensor -A- Circuit (Bank 2)

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 

Trouble Code: P0365



Camshaft Position Sensor -B- Circuit (Bank 1)

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 

Trouble Code: P0369



Crankshaft Position Sensor Rationality Check

Possible Causes:



CMP sensor circuit is open or shorted to ground
 
CMP sensor circuit is shorted to power
 
CMP sensor ground (return) circuit is open
 
CMP sensor installation incorrect (Hall-effect type)
 
CMP sensor is damaged or CMP sensor shielding damaged
 

Trouble Code: P0411



Secondary Air Injection System Upstream Flow Detected

Possible Causes:



Air pump output is blocked or restricted
 
AIR bypass solenoid is leaking or it is restricted
 
AIR bypass solenoid is stuck open or stuck closed
 
Check valve (one or more) is damaged or leaking
 
Electric air injection pump hose(s) leaking
 
Electric air injection pump is damaged or faulty
 

Trouble Code: P0412



Secondary Air Injection Solenoid Circuit Malfunction

Possible Causes:



AIR solenoid power circuit (B+) is open (check dedicated fuse)
 
AIR bypass solenoid control circuit is open or shorted to ground
 
AIR diverter solenoid control circuit open or shorted to ground
 
AIR pump control circuit is open or shorted to ground
 
Check valve (one or more) is damaged or leaking
 
Solid State relay is damaged or it has failed
 

Trouble Code: P0413



Secondary Air Injection Solenoid Circuit Open

Possible Causes:



AIR solenoid power circuit (B+) is open (check dedicated fuse)
 
AIR bypass solenoid control circuit is open or shorted to ground
 
AIR diverter solenoid control circuit open or shorted to ground
 
AIR pump control circuit is open or shorted to ground
 
Check valve (one or more) is damaged or leaking
 
Solid State relay is damaged or it has failed
 

Trouble Code: P0414



Secondary Air Injection Solenoid Circuit Short

Possible Causes:



AIR solenoid power circuit (B+) is open (check dedicated fuse)
 
AIR bypass solenoid control circuit is open or shorted to ground
 
AIR diverter solenoid control circuit open or shorted to ground
 
AIR pump control circuit is open or shorted to ground
 
Check valve (one or more) is damaged or leaking
 
Solid State relay is damaged or it has failed
 

Trouble Code: P0418



Secondary Air Injection Relay (A) Circuit Malfunction

Possible Causes:



AIR solenoid power circuit (B+) is open (check dedicated fuse)
 
AIR bypass solenoid control circuit is open or shorted to ground
 
AIR diverter solenoid control circuit open or shorted to ground
 
AIR pump control circuit is open or shorted to ground
 
Check valve (one or more) is damaged or leaking
 
Solid State relay is damaged or it has failed
 

Trouble Code: P0420



Catalyst System Efficiency (Bank 1) Below Threshold

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter is damaged, contaminated or it has failed
 
ECT/CHT sensor has lost its calibration (the signal is incorrect)
 
Engine cylinders misfiring, or the ignition timing is over retarded
 
Engine oil is contaminated
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 
Front HO2S and/or the rear HO2S is loose in the mounting hole
 
Front HO2S much older than the rear HO2S (HO2S-11 is lazy)
 
Fuel system pressure is too high (check the pressure regulator)
 
Rear HO2S wires improperly connected or the HO2S has failed
 

Trouble Code: P0430



Catalyst System Efficiency (Bank 2) Below Threshold

Possible Causes:



Air leaks at the exhaust manifold or in the exhaust pipes
 
Catalytic converter is damaged, contaminated or it has failed
 
ECT/CHT sensor has lost its calibration (the signal is incorrect)
 
Engine cylinders misfiring, or the ignition timing is over retarded
 
Engine oil is contaminated
 
Front HO2S or rear HO2S is contaminated with fuel or moisture
 
Front HO2S and/or the rear HO2S is loose in the mounting hole
 
Front HO2S much older than the rear HO2S (HO2S-11 is lazy)
 
Fuel system pressure is too high (check the pressure regulator)
 
Rear HO2S wires improperly connected or the HO2S has failed
 

Trouble Code: P0440



EVAP System Malfunction

Possible Causes:



EVAP canister purge valve is damaged
 
EVAP canister has an improper seal
 
Vapor line between purge solenoid and intake manifold vacuum reservoir is damaged, or vapor line between EVAP canister purge solenoid and charcoal canister is damaged
 
Vapor line between charcoal canister and check valve, or vapor line between check valve and fuel vapor valves is damaged
 

Trouble Code: P0441



EVAP Control System Incorrect Purge Flow

Possible Causes:



EVAP canister purge valve is damaged
 
EVAP canister has an improper seal
 
Vapor line between purge solenoid and intake manifold vacuum reservoir is damaged, or vapor line between EVAP canister purge solenoid and charcoal canister is damaged
 
Vapor line between charcoal canister and check valve, or vapor line between check valve and fuel vapor valves is damaged
 

Trouble Code: P0442



EVAP Control System Small Leak Detected

Possible Causes:



Aftermarket EVAP parts that do not conform to specifications
 
CV solenoid remains partially open when commanded to close
 
EVAP component seals leaking (i.e., leaks in the Purge valve, fuel tank pressure sensor, canister vent solenoid, fuel vapor control valve tube assembly or fuel vapor vent valve).
 
Fuel filler cap damaged, cross-threaded or loosely installed
 
Loose fuel vapor hose/tube connections to EVAP components
 
Small holes or cuts in fuel vapor hoses or EVAP canister tubes
 

Trouble Code: P0443



EVAP Vapor Management Valve Circuit Malfunction

Possible Causes:



EVAP power supply circuit is open
 
EVAP solenoid control circuit is open or shorted to ground
 
EVAP solenoid control circuit is shorted to power (B+)
 
EVAP solenoid valve is damaged or it has failed
 

Trouble Code: P0444



Evaporative Emission System Purge Control Valve Circuit Open

Possible Causes:



EVAP power supply circuit is open
 
EVAP solenoid control circuit is open or shorted to ground
 
EVAP solenoid control circuit is shorted to power (B+)
 
EVAP solenoid valve is damaged or it has failed
 
EVAP canister has a leak or a poor seal
 

Trouble Code: P0445



Evaporative Emission System Purge Control Valve Circuit Shorted

Possible Causes:



EVAP power supply circuit is open
 
EVAP solenoid control circuit is open or shorted to ground
 
EVAP solenoid control circuit is shorted to power (B+)
 
EVAP solenoid valve is damaged or it has failed
 
EVAP canister has a leak or a poor seal
 

 
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