Volkswagen Cars 2000-05

1.8L L4 - Auto 7

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Trouble Code: P1128



Long Term Fuel Trim Add. Air. Bank 1 System Too Lean

Possible Causes:



Fuel pressure is too low or fuel quantity supplied is too low
 
Fuel filter faulty
 
Transfer fuel pump has failed
 
Fuel injector is faulty (sticking or not opening)
 
Engine speed (RPM) sensor is faulty
 
MAF sensor circuit open
 
MAF sensor circuit shorted to ground
 
Air leak in the manifold
 
Secondary air injection system combi-valve stuck open
 
Secondary air injection system electrical short
 
ECM has failed
 

Trouble Code: P1136



Long Term Fuel Trim Add. Fuel, Bank 1 System Too Lean

Possible Causes:



Air intake system leaking, vacuum hoses leaking or damaged
 
Air leaks located after the MAF sensor mounting location
 
EGR valve sticking, EGR diaphragm leaking, or gasket leaking
 
EVAP vapor recovery system has failed
 
Excessive fuel pressure, leaking or contaminated fuel injectors
 
Exhaust leaks before or near the HO2S(s) mounting location
 
Fuel pressure regulator is leaking or damaged
 
HO2S circuits wet or oily, corroded, or poor terminal contact
 
HO2S is damaged or it has failed
 
HO2S signal circuit open, shorted to ground, shorted to power
 
Low fuel pressure or vehicle driven until it was out of fuel
 
Oil dipstick not seated or engine oil level too high (overfilled)
 

Trouble Code: P1137



Long Term Fuel Trim Add. Fuel, Bank 1 System Too Rich

Possible Causes:



Air intake system leaking, vacuum hoses leaking or damaged
 
Air leaks located after the MAF sensor mounting location
 
EGR valve sticking, EGR diaphragm leaking, or gasket leaking
 
EVAP vapor recovery system has failed
 
Excessive fuel pressure, leaking or contaminated fuel injectors
 
Exhaust leaks before or near the HO2S(s) mounting location
 
Fuel pressure regulator is leaking or damaged
 
HO2S circuits wet or oily, corroded, or poor terminal contact
 
HO2S is damaged or it has failed
 
HO2S signal circuit open, shorted to ground, shorted to power
 
Low fuel pressure or vehicle driven until it was out of fuel
 
Oil dipstick not seated or engine oil level too high (overfilled)
 

Trouble Code: P1141



Load Calculation Cross Check Range/Performance

Possible Causes:



Intake system is leaking
 
Signal is grounding
 
ECM has failed
 
Intake Manifold Runner Position Sensor is faulty
 
Intake system for leaks (false air) is faulty
 
Motor for intake flap is faulty
 
Mass Air Flow (MAF) sensor is faulty
 
Throttle Position (TP) sensor is faulty
 
Throttle valve control module is faulty
 

Trouble Code: P1142



Load Calculation Cross Check Lower Limit

Possible Causes:



Intake Manifold Runner Position Sensor is faulty
 
Intake system for leaks (false air) is faulty
 
Motor for intake flap is faulty
 
Mass Air Flow (MAF) sensor is faulty
 
Throttle Position (TP) sensor is faulty
 
Throttle valve control module is faulty
 
Intake system is leaking
 
Signal is grounding
 
ECM has failed
 

Trouble Code: P1143



Load Calculation Cross Check Upper Limit

Possible Causes:



Intake Manifold Runner Position Sensor is faulty
 
Intake system for leaks (false air) is faulty
 
Motor for intake flap is faulty
 
Mass Air Flow (MAF) sensor is faulty
 
Throttle Position (TP) sensor is faulty
 
Throttle valve control module is faulty
 
Intake system is leaking
 
Signal is grounding
 
ECM has failed
 

Trouble Code: P1149



O2 Control (Bank 1) Out of Range

Possible Causes:



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
 
Circuit wiring has a short to power or ground
 
Engine Component Power Supply Relay is faulty
 
E-box fuses for oxygen sensor are faulty
 
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: P1150



Lack of HO2S-21 Switching, Fuel Trim At Rich/Lean Limit

Possible Causes:



Air intake system leaking, vacuum hoses leaking or damaged
 
Air leaks located after the MAF sensor mounting location
 
EGR valve sticking, EGR diaphragm leaking, or gasket leaking
 
EVAP vapor recovery system has failed
 
Excessive fuel pressure, leaking or contaminated fuel injectors
 
Exhaust leaks before or near the HO2S(s) mounting location
 
Fuel pressure regulator is leaking or damaged
 
HO2S circuits wet or oily, corroded, or poor terminal contact
 
HO2S signal circuit open, shorted to ground, shorted to power, or the sensor has failed
 
Low fuel pressure or vehicle driven until it was out of fuel
 
Oil dipstick not seated or engine oil level too high (overfilled)
 

Trouble Code: P1151



Long Term Fuel Trim (Bank1, Range 1) Leanness Lower Limit Exceeded

Possible Causes:



Exhaust system is damaged
 
Intake Manifold Runner Position Sensor is faulty
 
Intake system for leaks (false air)
 
Motor for intake flap has failed
 
MAF sensor circuit open
 
MAF sensor circuit shorted to ground
 
Air leak in the manifold
 
Secondary air injection system combi-valve stuck open
 
Secondary air injection system electrical short
 
Fuel pressure too high, leaks in the vacuum hose to fuel pressure regulator
 
Fuel pressure regulator has failed
 
Fuel injectors are dirty, faulty or do not close properly
 

Trouble Code: P1152



Long Term Fuel Trim (Bank1, Range 2) Leanness Lower Limit Exceeded

Possible Causes:



Exhaust system is damaged
 
Intake Manifold Runner Position Sensor is faulty
 
Intake system for leaks (false air)
 
Motor for intake flap has failed
 
MAF sensor circuit open
 
MAF sensor circuit shorted to ground
 
Air leak in the manifold
 
Secondary air injection system combi-valve stuck open
 
Secondary air injection system electrical short
 
Fuel pressure too high, leaks in the vacuum hose to fuel pressure regulator
 
Fuel pressure regulator has failed
 
Fuel injectors are dirty, faulty or do not close properly
 

Trouble Code: P1165



Bank 1, Long Term Fuel Trim, Range 1 Rich Limit Exceeded

Possible Causes:



Exhaust system is damaged
 
Intake Manifold Runner Position Sensor is faulty
 
Intake system for leaks (false air)
 
Motor for intake flap has failed
 
MAF sensor circuit open
 
MAF sensor circuit shorted to ground
 
Air leak in the manifold
 
Secondary air injection system combi-valve stuck open
 
Secondary air injection system electrical short
 
Fuel pressure too high, leaks in the vacuum hose to fuel pressure regulator
 
Fuel pressure regulator has failed
 
Fuel injectors are dirty, faulty or do not close properly
 
EVAP canister system lacks a proper seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Leak Detection Pump (LDP) is faulty
 
Fuel injectors have failed
 
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: P1166



Bank 1, Long Term Fuel Trim, Range 2 Rich Limit Exceeded

Possible Causes:



Exhaust system is damaged
 
Intake Manifold Runner Position Sensor is faulty
 
Intake system for leaks (false air)
 
Motor for intake flap has failed
 
MAF sensor circuit open
 
MAF sensor circuit shorted to ground
 
Air leak in the manifold
 
Secondary air injection system combi-valve stuck open
 
Secondary air injection system electrical short
 
Fuel pressure too high, leaks in the vacuum hose to fuel pressure regulator
 
Fuel pressure regulator has failed
 
Fuel injectors are dirty, faulty or do not close properly
 
EVAP canister system lacks a proper seal
 
Evaporative Emission (EVAP) canister purge regulator valve 1 is faulty
 
Leak Detection Pump (LDP) is faulty
 
Fuel injectors have failed
 
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: P1171



Throttle Actuation Potentiometer Sign.2 Range/Performance

Possible Causes:



Throttle valve control module has failed
 
Throttle valve is dirty or damaged
 
Throttle valve is not in a closed position
 
Voltage supply of throttle valve control module is shorted or open
 
ECM has failed
 

Trouble Code: P1172



Throttle Actuation Potentiometer Sign.2 Signal Too Low

Possible Causes:



Throttle valve control module has failed
 
Throttle valve is dirty or damaged
 
Throttle valve is not in a closed position
 
Voltage supply of throttle valve control module is shorted or open
 
ECM has failed
 

Trouble Code: P1173



Throttle Actuation Potentiometer Sign.2 Signal Too High

Possible Causes:



Throttle valve control module has failed
 
Throttle valve is dirty or damaged
 
Throttle valve is not in a closed position
 
Voltage supply of throttle valve control module is shorted or open
 
ECM has failed
 

Trouble Code: P1176



O2 Correction Behind Catalyst B1 Limit Attained

Possible Causes:



O2 sensor circuit has shorted to ground or B+
 
O2 sensor circuit is open
 
ECM has failed
 
O2 sensor has failed
 
Intake Manifold Runner Position Sensor is faulty
 
Intake system for leaks (false air) is faulty
 
Motor for intake flap is faulty
 

Trouble Code: P1196



O2 Sensor Heater Circuit (Bank 1-Sensor 1) Electrical 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
 
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: P1198



O2 Sensor Heater Circuit (Bank 1-Sensor 2) Electrical 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
 
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: P1200



Turbocharger Bypass Valve Mechanical Malfunction

Possible Causes:



Charge air pressure sensor is faulty
 
Voltage supply to the charge air pressure sensor is open or shorted
 
Check the charge air system for leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged or not functioning properly
 
Turbocharger recirculating valve is faulty
 
Vacuum diaphragm for turbocharger is out of adjustment
 
Wastegate bypass regulator valve is faulty
 
Boost sensor has failed
 
ECM has failed
 

Trouble Code: P1201



Cylinder 1 Fuel Injection Circuit Electrical Malfunction

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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 
Faulty engine speed sensor
 

Trouble Code: P1202



Cylinder 2 Fuel Injection Circuit Electrical Malfunction

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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 
Faulty engine speed sensor
 

Trouble Code: P1203



Cylinder 3 Fuel Injection Circuit Electrical Malfunction

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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 
Faulty engine speed sensor
 

Trouble Code: P1204



Cylinder 4 Fuel Injection Circuit Electrical Malfunction

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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Fuel injectors may have malfunctioned
 
Faulty engine speed sensor
 

Trouble Code: P1213



Cylinder 1 Fuel Injection Circuit 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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1214



Cylinder 2 Fuel Injection Circuit 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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1215



Cylinder 3 Fuel Injection Circuit 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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1216



Cylinder 4 Fuel Injection Circuit 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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1225



Cylinder 1 Fuel Injection Circuit 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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1226



Cylinder 2 Fuel Injection Circuit 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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1227



Cylinder 3 Fuel Injection Circuit 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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1228



Cylinder 4 Fuel Injection Circuit 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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1237



Cylinder 1 Fuel Injection Circuit Open Circuit

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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1238



Cylinder 2 Fuel Injection Circuit Open Circuit

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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1239



Cylinder 3 Fuel Injection Circuit Open Circuit

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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1240



Cylinder 4 Fuel Injection Circuit Open Circuit

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
 
ECM is not connected or has failed
 
Fuel pump relay has failed
 
Engine speed sensor has failed
 

Trouble Code: P1250



Fuel Pressure Regulator Control Circuit Malfunction (Fuel Level too Low)

Possible Causes:



FPRC solenoid valve harness circuits are open or shorted
 
FPRC input port or output port vacuum lines are damaged
 
FRPC solenoid is damaged
 
Fuel level is too low
 
ECM has failed
 

Trouble Code: P1255



Engine Coolant Temperature Circuit Short to Ground

Possible Causes:



Coolant Temperature Sensor has failed
 
Circuit short to ground, open or other component
 
ECM has failed
 

Trouble Code: P1256



Engine Coolant Temperature Circuit Open/Short to B+

Possible Causes:



Coolant Temperature Sensor has failed
 
Circuit short to ground, open or other component
 
ECM has failed
 

Trouble Code: P1287



Turbocharger Bypass Valve Open

Possible Causes:



Charge air system check for leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system may be damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 
Bypass solenoid power supply circuit is open
 
Bypass solenoid control circuit is open, shorted to ground or system power
 
Bypass solenoid assembly is damaged or has failed
 
Charge air pressure sensor is faulty
 
Voltage supply to the charge air pressure sensor is open or shorted
 
Check the charge air system for leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged or not functioning properly
 
Turbocharger recirculating valve is faulty
 
Vacuum diaphragm for turbocharger is out of adjustment
 
Wastegate bypass regulator valve is faulty
 
ECM has failed
 

Trouble Code: P1288



Turbocharger Bypass Valve Short to B+

Possible Causes:



Charge air system check for leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system may be damaged
 
Vacuum diaphragm for turbocharger needs adjusting
 
Wastegate bypass regulator valve is faulty
 
Bypass solenoid power supply circuit is open
 
Bypass solenoid control circuit is open, shorted to ground or system power
 
Bypass solenoid assembly is damaged or has failed
 
Charge air pressure sensor is faulty
 
Voltage supply to the charge air pressure sensor is open or shorted
 
Check the charge air system for leaks
 
Recirculating valve for turbocharger is faulty
 
Turbocharging system is damaged or not functioning properly
 
Turbocharger recirculating valve is faulty
 
Vacuum diaphragm for turbocharger is out of adjustment
 
Wastegate bypass regulator valve is faulty
 
ECM has failedvalve is faulty
 

 
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