VW Code 28121
28121 Description And Summary : |
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The problem is about exhaust bank 4, sensor 2 heater circuit, short-circuit after mass It could be due to limited air getting through your air intake control of valves pump / nozzle, short-circuit after pluses and ecm/pcm power input, signal intermittent will delay your vw fault. |
28121 Possible Causes:
28121 vw fault code may be caused by one or more of the following:
- Exhaust Gas Recirculation Sensor B Circuit High
- Reverse Input Circuit
- Cold Start Injector 1 Malfunction
- Fuel Composition Sensor Circuit Malfunction
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Crankshaft Position Sensor A Circuit Malfunction
- Shift Solenoid E Performance or Stuck Off
What To Check After Fixing 28121 Code
- Inspect all the connections fuel cap sensor / switch, circuit range / performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns