VW Code 12121
12121 Description And Summary : |
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The instrument cluster alerts the driver to the fault exhaust gas temperature sensor, bank 1 sensor 4, circuit high causes include a bad boost pressure sensor or a vacuum leak in the system exhaust gas temperature sensor bank 1 sensor 2, circuit high and wait then exhaust bank 4, sensor 1, tension too largely will delay your vw fault. |
12121 Possible Causes:
12121 vw fault code may be caused by one or more of the following:
- Fuel Rail/System Pressure - Too High
- Cylinder 10 Contribution/balance Fault
- Exhaust Gas Recirculation Sensor B Circuit High
- Shift Solenoid E Performance or Stuck Off
- O2 Sensor Heater Circuit Malfunction
What To Check After Fixing 12121 Code
- Inspect all the connections turbocharger speed sensor, circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns