Volkswagen Cars 2000-05

4.0L W8 - Auto 4

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Trouble Code: P1321



Knock Sensor 3 Circuit 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
 
ECM has failed
 

Trouble Code: P1322



Knock Sensor 3 Circuit 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
 
ECM has failed
 

Trouble Code: P1323



Knock Sensor 4 Circuit 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
 
ECM has failed
 

Trouble Code: P1324



Knock Sensor 4 Circuit 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
 
ECM has failed
 

Trouble Code: P1586



Engine Mount Valves Short to B+

Possible Causes:



Electro-hydraulic engine mount solenoid valve has failed
 
ECM has failed
 
Circuit wires have shorted to B+ or ground
 

Trouble Code: P1587



Engine Mount Valves Short to Ground

Possible Causes:



Electro-hydraulic engine mount solenoid valve has failed
 
ECM has failed
 
Circuit wires have shorted to B+ or ground
 

Trouble Code: P1588



Engine Mount Valves Open

Possible Causes:



Electro-hydraulic engine mount solenoid valve has failed
 
ECM has failed
 
Circuit wires have shorted to B+ or ground
 

Trouble Code: P2179



System Too Lean Off Idle Bank 2

Possible Causes:



Intake Manifold Runner Position Sensor has failed
 
Intake system has leaks (false air)
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
Fuel Injector(s) may have failed
 
ECM has failed
 

Trouble Code: P2180



System Too Rich Off Idle Bank 2

Possible Causes:



Intake Manifold Runner Position Sensor has failed
 
Intake system has leaks (false air)
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
Fuel Injector(s) may have failed
 
ECM has failed
 

Trouble Code: P2187



System Too Lean On Idle Bank 1

Possible Causes:



Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Exhaust system components are damaged
 
Fuel injectors are faulty
 
Fuel pressure regulator and residual pressure have failed
 
Fuel Pump (FP) in fuel tank is faulty
 
Intake system has leaks (false air)
 
Secondary Air Injection (AIR) system has an improper seal
 
Intake Manifold Runner Position Sensor has failed
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2188



System Too Rich On Idle Bank 1

Possible Causes:



Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Exhaust system components are damaged
 
Fuel injectors are faulty
 
Fuel pressure regulator and residual pressure have failed
 
Fuel Pump (FP) in fuel tank is faulty
 
Intake system has leaks (false air)
 
Secondary Air Injection (AIR) system has an improper seal
 
Intake Manifold Runner Position Sensor has failed
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2189



System Too Lean On Idle Bank 2

Possible Causes:



Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Exhaust system components are damaged
 
Fuel injectors are faulty
 
Fuel pressure regulator and residual pressure have failed
 
Fuel Pump (FP) in fuel tank is faulty
 
Intake system has leaks (false air)
 
Secondary Air Injection (AIR) system has an improper seal
 
Intake Manifold Runner Position Sensor has failed
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2190



System Too Rich On Idle Bank 2

Possible Causes:



Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Exhaust system components are damaged
 
Fuel injectors are faulty
 
Fuel pressure regulator and residual pressure have failed
 
Fuel Pump (FP) in fuel tank is faulty
 
Intake system has leaks (false air)
 
Secondary Air Injection (AIR) system has an improper seal
 
Intake Manifold Runner Position Sensor has failed
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2191



System Too Lean at Higher Load Bank 1

Possible Causes:



Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Exhaust system components are damaged
 
Fuel injectors are faulty
 
Fuel pressure regulator and residual pressure have failed
 
Fuel Pump (FP) in fuel tank is faulty
 
Intake system has leaks (false air)
 
Secondary Air Injection (AIR) system has an improper seal
 
Intake Manifold Runner Position Sensor has failed
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2192



System Too Rich at Higher Load Bank 1

Possible Causes:



Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Exhaust system components are damaged
 
Fuel injectors are faulty
 
Fuel pressure regulator and residual pressure have failed
 
Fuel Pump (FP) in fuel tank is faulty
 
Intake system has leaks (false air)
 
Secondary Air Injection (AIR) system has an improper seal
 
Intake Manifold Runner Position Sensor has failed
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2193



System Too Lean at Higher Load Bank 2

Possible Causes:



Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Exhaust system components are damaged
 
Fuel injectors are faulty
 
Fuel pressure regulator and residual pressure have failed
 
Fuel Pump (FP) in fuel tank is faulty
 
Intake system has leaks (false air)
 
Secondary Air Injection (AIR) system has an improper seal
 
Intake Manifold Runner Position Sensor has failed
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2194



System Too Rich at Higher Load Bank 2

Possible Causes:



Evaporative Emission (EVAP) canister purge regulator valve is faulty
 
Exhaust system components are damaged
 
Fuel injectors are faulty
 
Fuel pressure regulator and residual pressure have failed
 
Fuel Pump (FP) in fuel tank is faulty
 
Intake system has leaks (false air)
 
Secondary Air Injection (AIR) system has an improper seal
 
Intake Manifold Runner Position Sensor has failed
 
Motor for intake flap is faulty
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Check circuits for shorts to each other, ground or power
 
ECM has failed
 

Trouble Code: P2195



O2 Sensor Signal Stuck Lean Bank 1 Sensor 1

Possible Causes:



Engine oil level high
 
Camshaft timing error
 
Cylinder compression low
 
Exhaust leaks in front of O2S
 
EGR valve is stuck open
 
EGR gasket is leaking
 
EVR diaphragm is leaking
 
Damaged fuel pressure regulator or extremely low fuel pressure
 
O2S circuit is open or shorted in the wiring harness
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Air leaks after the MAF sensor
 
PCV system leaks
 
Dip stick not seated properly
 

Trouble Code: P2196



O2 Sensor Signal Stuck Rich Bank 1 Sensor 1

Possible Causes:



Engine oil level high
 
Camshaft timing error
 
Cylinder compression low
 
Exhaust leaks in front of O2S
 
EGR valve is stuck open
 
EGR gasket is leaking
 
EVR diaphragm is leaking
 
Damaged fuel pressure regulator or extremely low fuel pressure
 
O2S circuit is open or shorted in the wiring harness
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
Air leaks after the MAF sensor
 
PCV system leaks
 
Dip stick not seated properly
 

Trouble Code: P2234



O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 1

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
O2S circuit is open or shorted in the wiring harness
 
ECM has failed
 

Trouble Code: P2240



O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
O2S circuit is open or shorted in the wiring harness
 
ECM has failed
 

Trouble Code: P2247



O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
O2S circuit is open or shorted in the wiring harness
 
ECM has failed
 

Trouble Code: P2254



O2 Sensor Negative Voltage Circuit/Open Bank 2 Sensor 1

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
O2S circuit is open or shorted in the wiring harness
 
ECM has failed
 

Trouble Code: P2272



O2 Sensor Signal Stuck Lean Bank 2 Sensor 2

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
O2S circuit is open or shorted in the wiring harness
 
ECM has failed
 

Trouble Code: P2273



O2 Sensor Signal Stuck Rich Bank 2 Sensor 2

Possible Causes:



Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 
O2S circuit is open or shorted in the wiring harness
 
ECM has failed
 

Trouble Code: P2400



EVAP Leak Detection Pump (LDP) Control Circuit Open

Possible Causes:



EVAP LDP power supply circuit is open
 
EVAP LDP solenoid valve is damaged or it has failed
 
EVAP LDP canister has a leak or a poor seal
 
ECM has failed
 
EVAP canister system has an improper seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 has failed
 
Leak Detection Pump (LDP) is faulty
 
Aftermarket EVAP parts that do not conform to specifications
 
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).
 

Trouble Code: P2401



EVAP Leak Detection Pump Control Circuit Low

Possible Causes:



EVAP LDP power supply circuit is open
 
EVAP LDP solenoid valve is damaged or it has failed
 
EVAP LDP canister has a leak or a poor seal
 
ECM has failed
 
EVAP canister system has an improper seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 has failed
 
Leak Detection Pump (LDP) is faulty
 
Aftermarket EVAP parts that do not conform to specifications
 
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).
 

Trouble Code: P2402



EVAP Leak Detection Pump Control Circuit High

Possible Causes:



EVAP LDP power supply circuit is open
 
EVAP LDP solenoid valve is damaged or it has failed
 
EVAP LDP canister has a leak or a poor seal
 
ECM has failed
 
EVAP canister system has an improper seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 has failed
 
Leak Detection Pump (LDP) is faulty
 
Aftermarket EVAP parts that do not conform to specifications
 
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).
 

Trouble Code: P2403



EVAP Leak Detection Pump Sense Circuit Open

Possible Causes:



EVAP LDP power supply circuit is open
 
EVAP LDP solenoid valve is damaged or it has failed
 
EVAP LDP canister has a leak or a poor seal
 
ECM has failed
 
EVAP canister system has an improper seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 has failed
 
Leak Detection Pump (LDP) is faulty
 
Aftermarket EVAP parts that do not conform to specifications
 
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).
 

Trouble Code: P2404



EVAP Leak Detection Pump Sense Circuit Range/Performance

Possible Causes:



EVAP LDP power supply circuit is open
 
EVAP LDP solenoid valve is damaged or it has failed
 
EVAP LDP canister has a leak or a poor seal
 
ECM has failed
 
EVAP canister system has an improper seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 has failed
 
Leak Detection Pump (LDP) is faulty
 
Aftermarket EVAP parts that do not conform to specifications
 
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).
 

Trouble Code: P2600



Coolant Pump Control Circuit/Open

Possible Causes:



Check activation of Recirculation Pump Relay
 
Recirculation pump has failed
 
Coolant Temperature Sensor has failed
 
Circuit short to ground, open or other component
 
ECM has failed
 

Trouble Code: P2602



Coolant Pump Control Circuit Low

Possible Causes:



Check activation of Recirculation Pump Relay
 
Recirculation pump has failed
 
Coolant Temperature Sensor has failed
 
Circuit short to ground, open or other component
 
ECM has failed
 

Trouble Code: P2603



Coolant Pump Control Circuit High

Possible Causes:



Check activation of Recirculation Pump Relay
 
Recirculation pump has failed
 
Coolant Temperature Sensor has failed
 
Circuit short to ground, open or other component
 
ECM has failed
 

Trouble Code: P2629



O2 Sensor Pumping Current Trim Circuit/Open Bank 2 Sensor 1

Possible Causes:



Check activation of Recirculation Pump Relay
 
Oxygen sensor (before catalytic converter) is faulty
 
Oxygen sensor (behind catalytic converter) is faulty
 
Oxygen sensor heater (before catalytic converter) is faulty
 
Oxygen sensor heater (behind catalytic converter) is faulty
 

Trouble Code: U0001



High Speed CAN Communication Bus

Possible Causes:



ECM has failed
 
CAN data bus wires have short circuited to each other
 

Trouble Code: U0101



Lost Communication With TCM

Possible Causes:



ECM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 
TCM has failed
 

Trouble Code: U0121



Lost Communication With Anti-Lock Brake System (ABS) Control Module

Possible Causes:



ECM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 
There is a fault with the ABS control module
 

Trouble Code: U0155



Lost Communication With Instrument Cluster

Possible Causes:



ECM has failed
 
Terminal resistance for CAN-bus are faulty
 
Can data bus wires have short circuited to each other
 

 
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