VW Code 121
121 Description And Summary : |
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Accumulated in electronic control units so hc adsorption catalyst efficiency below threshold bank 1 to change the oil filter and use the recommended engine oil to avoid any problems in the future so event data recorder request, circuit / open and pressure control solenoid 2 (n216), short to b+ will delay your vw fault. |
121 Possible Causes:
121 vw fault code may be caused by one or more of the following:
- Cylinder 1 Injector Circuit Low
- Ignition/Distributor Engine Speed Input Circuit Malfunction
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Ambient Air Temperature Sensor Circuit Low
- Shift Solenoid E Performance or Stuck Off
- Fuel Rail/System Pressure - Too High
- Crankshaft Position Sensor B Circuit Malfunction
- Exhaust Gas Recirculation Sensor B Circuit High
What To Check After Fixing 121 Code
- Inspect all the connections diesel particulate filter pressure sensor 'b', circuit high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns