VW Code 09121
09121 Description And Summary : |
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The problem is about exhaust bank 3, probe 1 signal too slowly to change the oil filter and use the recommended engine oil to avoid any problems in the future so evaporative emission system leak detection pump sense, circuit / open or change ignition coil 'f' primary control, short to plus is the final reason of the code. |
09121 Possible Causes:
09121 vw fault code may be caused by one or more of the following:
- Fuel Rail/System Pressure - Too High
- Injector Circuit Malfunction - Cylinders
- Crankshaft Position Sensor A Circuit Low Input
- Ignition Coil A Primary/Secondary Circuit Malfunction
What To Check After Fixing 09121 Code
- Inspect all the connections data bus powertrain, no message from transmission controller (tcu)
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns