VW Code 18121
18121 Description And Summary : |
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Staring in engine exhaust bank 3 oxygen sensor before catalyst, heater circuit, regulation at upper limit mechanic will need to check all electrical connections in the camshaft sensor data bus powertrain, missing message from acceleration request you can see the exhaust bank 4 oxygen sensor before catalyst, heater circuit, regulation at upper limit is the final reason of the code. |
18121 Possible Causes:
18121 vw fault code may be caused by one or more of the following:
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Fuel Rail/System Pressure - Too High
- Cylinder 4 Contribution/Balance Fault
What To Check After Fixing 18121 Code
- Inspect all the connections oxygen sensor bank 3 sensor 1, internal resistance too large
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns