BMW Cars 1999-06

2.5L L6 - Std 2

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Trouble Code: P0137



HO2S (Bank 1 Sensor 2) Circuit Low Input

Possible Causes:



HO2S signal shorted to heater power circuit in the connector
 
HO2S signal circuit shorted to ground (for more than 200 seconds) or to system voltage
 

Trouble Code: P0138



HO2S (Bank 1 Sensor 2) Circuit High Input

Possible Causes:



HO2S signal shorted to heater power circuit in the positive connector
 
HO2S signal circuit shorted to ground or to system voltage
 
HO2S has failed
 

Trouble Code: P0139



HO2S (Bank 1 Sensor 2) Slow Response

Possible Causes:



HO2S signal shorted to heater power circuit in the connector
 
HO2S signal circuit shorted to VREF or to system voltage
 

Trouble Code: P0140



HO2S (Bank 1 Sensor 2) No Activity

Possible Causes:



HO2S before the three-way catalytic converter is contaminated (due to presence of silicone in fuel); Run the engine for three minutes at 3500rpm as a self-cleaning effect
 
Leaks present in the exhaust manifold or exhaust pipes
 
HO2S signal wire and ground wire crossed in connector (voltage jumps)
 
HO2S element is contaminated or has failed
 

Trouble Code: P0141



HO2S (Bank 1 Sensor 2) Malfunction

Possible Causes:



Leaks present in the exhaust manifold or exhaust pipes
 
HO2S signal wire and ground wire crossed in connector
 
HO2S element is fuel contaminated or has failed
 

Trouble Code: P0150



HO2S (Bank 2 Sensor 1) Circuit Malfunction

Possible Causes:



Leaks present in the exhaust manifold or exhaust pipes
 
HO2S signal wire and ground wire crossed in connector
 
HO2S element is fuel contaminated or has failed
 

Trouble Code: P0151



HO2S (Bank 2 Sensor 1) Low Input

Possible Causes:



HO2S is contaminated (due to presence of silicone in fuel)
 
HO2S signal tracking (due to oil or moisture in the connector)
 
HO2S signal circuit is open or shorted to VREF
 

Trouble Code: P0152



HO2S (Bank 2 Sensor 1) Circuit High Input

Possible Causes:



HO2S is contaminated (due to presence of silicone in fuel)
 
HO2S signal tracking (due to oil or moisture in the connector)
 
HO2S signal circuit is open or shorted to VREF
 

Trouble Code: P0153



HO2S (Bank 2 Sensor 1) Circuit Slow Response

Possible Causes:



HO2S is contaminated (due to presence of silicone in fuel)
 
Leaks present in the exhaust manifold or exhaust pipes
 
HO2S is damaged or has failed
 

Trouble Code: P0154



HO2S (Bank 2 Sensor 1) Circuit No Activity

Possible Causes:



Leaks present in the exhaust manifold or exhaust pipes
 
HO2S signal wire and ground wire crossed in connector
 
HO2S element is fuel contaminated or has failed
 

Trouble Code: P0155



HO2S (Bank 2 Sensor 1) Heater Circuit Malfunction

Possible Causes:



HO2S heater power circuit is open
 
HO2S heater ground circuit is open
 
HO2S signal tracking (due to oil or moisture in the connector)
 
HO2S is damaged or has failed
 

Trouble Code: P0156



HO2S (Bank 2 Sensor 2) Circuit No Activity

Possible Causes:



Leaks present in the exhaust manifold or exhaust pipes
 
HO2S signal wire and ground wire crossed in connector
 
HO2S element is fuel contaminated or has failed
 

Trouble Code: P0157



HO2S (Bank 2 Sensor 2) Circuit Low Voltage

Possible Causes:



HO2S is contaminated (due to presence of silicone in fuel)
 
HO2S signal tracking (due to oil or moisture in the connector)
 
HO2S signal circuit is open or shorted to VREF
 

Trouble Code: P0158



HO2S (Bank 2 Sensor 2) Circuit High Input

Possible Causes:



HO2S signal shorted to the heater power circuit (due to oil or moisture in the connector)
 
HO2S signal circuit shorted to VREF or to system voltage
 

Trouble Code: P0159



HO2S (Bank 2 Sensor 2) Circuit Slow Response

Possible Causes:



HO2S is contaminated (due to presence of silicone in fuel)
 
Leaks present in the exhaust manifold or exhaust pipes
 
HO2S is damaged or has failed
 

Trouble Code: P0160



HO2S (Bank 2 Sensor 2) Circuit No Activity Detected

Possible Causes:



Leaks present in the exhaust manifold or exhaust pipes
 
HO2S signal wire and ground wire crossed in connector
 
HO2S element is fuel contaminated or has failed
 

Trouble Code: P0161



HO2S (Bank 2 Sensor 2) Heater Circuit Malfunction

Possible Causes:



HO2S heater power circuit or the heater ground circuit is open
 
HO2S signal tracking (due to oil or moisture in the connector)
 
HO2S has failed, or the DME has failed
 

Trouble Code: P0170



Fuel System Malfunction (Cylinder Bank 1)

Possible Causes:



Air leaks after the MAF sensor, or leaks in the PCV system
 
Exhaust leaks before or near where the HO2S is mounted
 
Fuel injector(s) restricted or not supplying enough fuel
 
Fuel system not supplying enough fuel during high fuel demand conditions (e.g., the fuel pump may not supply enough fuel)
 
Leaking EGR gasket, or leaking EGR valve diaphragm
 
MAF sensor dirty (causes DME to underestimate airflow)
 
Vehicle running out of fuel or engine oil dip stick not seated
 

Trouble Code: P0171



Fuel System Too Lean (Cylinder Bank 1)

Possible Causes:



Air leaks after the MAF sensor, or leaks in the PCV system
 
Exhaust leaks before or near where the HO2S is mounted
 
Fuel injector(s) restricted or not supplying enough fuel
 
Fuel pump not supplying enough fuel during high fuel demand conditions
 
Leaking EGR gasket, or leaking EGR valve diaphragm
 
MAF sensor dirty (causes DME to underestimate airflow)
 
Vehicle running out of fuel or engine oil dip stick not seated
 

Trouble Code: P0172



Fuel System Too Rich (Cylinder Bank 1)

Possible Causes:



Camshaft timing is incorrect, or the engine has an oil overfill condition
 
EVAP vapor recovery system failure (may be pulling vacuum)
 
Fuel pressure regulator is damaged or leaking
 
HO2S element is contaminated with alcohol or water
 
MAF or MAP sensor values are incorrect or out-of-range
 
One of more fuel injectors is leaking
 

Trouble Code: P0173



Fuel System Malfunction (Cylinder Bank 1)

Possible Causes:



Air leaks after the MAF sensor, or leaks in the PCV system
 
Exhaust leaks before or near where the HO2S is mounted
 
Fuel injector(s) restricted or not supplying enough fuel
 
Fuel system not supplying enough fuel during high fuel demand conditions (e.g., the fuel pump may not supply enough fuel)
 
Leaking EGR gasket, or leaking EGR valve diaphragm
 
MAF sensor dirty (causes DME to underestimate airflow)
 
Vehicle running out of fuel or engine oil dip stick not seated
 

Trouble Code: P0174



Fuel System Too Lean (Cylinder Bank 2)

Possible Causes:



Air leaks after the MAF sensor, or leaks in the PCV system
 
Exhaust leaks before or near where the HO2S is mounted
 
Fuel injector(s) restricted or not supplying enough fuel
 
Fuel pump not supplying enough fuel during high fuel demand conditions
 
Leaking EGR gasket, or leaking EGR valve diaphragm
 
MAF sensor dirty (causes DME to underestimate airflow)
 
Vehicle running out of fuel or engine oil dip stick not seated
 

Trouble Code: P0175



Fuel System Too Rich (Cylinder Bank 2)

Possible Causes:



Air leaks after the MAF sensor, or leaks in the PCV system
 
Exhaust leaks before or near where the HO2S is mounted
 
Fuel injector(s) restricted or not supplying enough fuel
 
Fuel pump not supplying enough fuel during high fuel demand conditions
 
Leaking EGR gasket, or leaking EGR valve diaphragm
 
MAF sensor dirty (causes DME to underestimate airflow)
 
Vehicle running out of fuel or engine oil dip stick not seated
 

Trouble Code: P0201



Cylinder 1 Injector Circuit Malfunction

Possible Causes:



Injector 1 connector is damaged, open or shorted
 
Injector 1 control circuit is open, shorted to ground or to power
 
(the injector driver circuit may be damaged)
 

Trouble Code: P0202



Cylinder 2 Injector Circuit Malfunction

Possible Causes:



Injector 2 connector is damaged, open or shorted
 
Injector 2 control circuit is open, shorted to ground or to power
 
(the injector driver circuit may be damaged)
 

Trouble Code: P0203



Cylinder 3 Injector Circuit Malfunction

Possible Causes:



Injector 3 connector is damaged, open or shorted
 
Injector 3 control circuit is open, shorted to ground or to power
 
(the injector driver circuit may be damaged)
 

Trouble Code: P0204



Cylinder 4 Injector Circuit Malfunction

Possible Causes:



Injector 4 connector is damaged, open or shorted
 
Injector 4 control circuit is open, shorted to ground or to power
 
(the injector driver circuit may be damaged)
 

Trouble Code: P0205



Cylinder 5 Injector Circuit Malfunction

Possible Causes:



Injector 5 connector is damaged, open or shorted
 
Injector 5 control circuit is open, shorted to ground or to power
 
(the injector driver circuit may be damaged)
 

Trouble Code: P0206



Cylinder 6 Injector Circuit Malfunction

Possible Causes:



Injector 6 connector is damaged, open or shorted
 
Injector 6 control circuit is open, shorted to ground or to power
 
(the injector driver circuit may be damaged)
 

Trouble Code: P0207



Cylinder 7 Injector Circuit Malfunction

Possible Causes:



Injector 7 connector is damaged, open or shorted
 
Injector 7 control circuit is open, shorted to ground or to power
 
(the injector driver circuit may be damaged)
 

Trouble Code: P0221



Throttle Position Sensor 'B' Signal Performance

Possible Causes:



Throttle body is damaged
 
Throttle linkage is binding or sticking
 
ETC TP Sensor 'B' signal circuit to the DME is open
 
ETC TP Sensor 'B' ground circuit is open
 
ETC TP Sensor 'B' is damaged or it has failed
 

Trouble Code: P0222



Throttle Position Sensor 'B' Circuit Low Input

Possible Causes:



ETC TP Sensor 'B' connector is damaged or shorted
 
ETC TP Sensor 'B' signal circuit is shorted to ground
 
ETC TP Sensor 'B' is damaged or it has failed
 

Trouble Code: P0223



Throttle Position Sensor 'B' Circuit High Input

Possible Causes:



ETC TP Sensor 'B' connector is damaged or open
 
ETC TP Sensor 'B' signal circuit is open
 
ETC TP Sensor 'B' signal circuit is shorted to VREF (5v)
 
ETC TP Sensor 'B' is damaged or it has failed
 

Trouble Code: P0261



Cylinder 1 Injector Circuit Low Input/Short to Ground

Possible Causes:



Injector 1 control circuit is open
 
Injector 1 power circuit (B+) is open
 
Injector 1 control circuit is shorted to chassis ground
 
Injector 1 is damaged or has failed
 
DME is not connected or has failed
 

Trouble Code: P0262



Cylinder 1 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: P0264



Cylinder 2 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: P0265



Cylinder 2 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: P0267



Cylinder 3 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: P0268



Cylinder 3 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: P0270



Cylinder 4 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
 

 
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