VW Code 00121
00121 Description And Summary : |
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Staring in engine wheel speed signal 2, range / performance It could be due to limited air getting through your air intake data-bus powertrain, missing message from engine controller (ecu) and charging system, voltage is the final reason of the code. |
00121 Possible Causes:
00121 vw fault code may be caused by one or more of the following:
- Fuel Rail Pressure Sensor Circuit Malfunction
- Reverse Input Circuit
- Injector Circuit Malfunction - Cylinders
- Engine Oil Temperature Sensor Malfunction
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Glow Plug/Heater Circuit 'A' Malfunction
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Fuel Rail/System Pressure - Too High
What To Check After Fixing 00121 Code
- Inspect all the connections glow plug/heater relay circuit, electrical
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns