Volkswagen Cars 2000-05

2.8L V6 VIN D Auto 2

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Trouble Code: P0123



TP Sensor Circuit High Input

Possible Causes:



TP sensor not seated correctly in housing (may be damaged)
 
TP sensor signal is circuit shorted to ground or system voltage
 
TP sensor ground circuit is open (check the wiring harness)
 
TP sensor and/or ECM has failed
 

Trouble Code: P0125



Insufficient Coolant Temperature For Closed Loop

Possible Causes:



Check the coolant mixture for an incorrect mixture
 
Check the operation of the thermostat (it may be stuck open or has failed)
 
ECT sensor has failed or is disconnected
 
Inspect for low coolant level
 

Trouble Code: P0130



O2 Sensor Circuit Bank 1 Sensor 1

Possible Causes:



Oxygen sensor heater for oxygen sensor (HO2S) before catalytic converter is faulty
 
HO2S is contaminated (due to presence of silicone in fuel)
 
HO2S signal and ground circuit wires crossed in wiring harness
 
HO2S signal circuit is shorted to sensor or chassis ground
 
HO2S element before the catalytic converter has failed (internal short condition)
 
Leaks present in the exhaust manifold or exhaust pipes
 
ECM has failed
 

Trouble Code: P0131



HO2S (Bank 1 Sensor 1) Circuit Low Input

Possible Causes:



HO2S is contaminated (due to presence of silicone in fuel)
 
HO2S signal and ground circuit wires crossed in wiring harness
 
HO2S signal circuit is shorted to sensor or chassis ground
 
HO2S element has failed (internal short condition)
 
Leaks present in the exhaust manifold or exhaust pipes
 
ECM has failed
 

Trouble Code: P0132



HO2S (Bank 1 Sensor 1) Circuit High Input

Possible Causes:



HO2S is contaminated (due to presence of silicone in fuel)
 
HO2S signal and ground circuit wires crossed in wiring harness
 
HO2S signal circuit is shorted to sensor or chassis ground
 
HO2S element has failed (internal short condition)
 
Leaks present in the exhaust manifold or exhaust pipes
 
ECM has failed
 

Trouble Code: P0133



HO2S (Bank 1 Sensor 1) Circuit Slow Response

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
 
HO2S signal circuit open
 
Leaks present in the exhaust manifold or exhaust pipes
 
HO2S is damaged or has failed
 
ECM has failed
 

Trouble Code: P0134



HO2S (Bank 1 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 (voltage jumps)
 
HO2S element is fuel contaminated or has failed
 
ECM has failed
 

Trouble Code: P0135



HO2S (Bank 1 Sensor 1) Heater Circuit Malfunction

Possible Causes:



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

Trouble Code: P0136



HO2S (Bank 1 Sensor 2) 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
 
ECM has failed
 

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
 
ECM has failed
 

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
 
ECM 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
 
ECM has failed
 

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
 
ECM 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
 
ECM 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
 
ECM 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
 
ECM has failed
 

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
 
ECM has failed
 

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
 
ECM 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
 
ECM 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
 
ECM 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
 
ECM 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
 
ECM has failed
 

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
 
ECM has failed
 

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
 
ECM 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
 
ECM 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 ECM 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 ECM 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 ECM 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: 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 ECM 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 ECM 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
 
ECM has failed (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
 
ECM has failed (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
 
ECM has failed (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
 
ECM has failed (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
 
ECM has failed (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
 
ECM has failed (the injector driver circuit may be damaged)
 

Trouble Code: P0219



Engine Over-Speed Condition

Possible Causes:



Engine operated in the wrong transmission gear position
 
Excessive engine speed with gear selector in Neutral position
 
Wheel slippage due to wet, muddy or snowing conditions
 

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 ECM 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
 
ECM has failed
 

 
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