VW Code 18940
18940 Description And Summary : |
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Diagnosing engine bar with direct ozone reduction catalyst, efficiency below threshold It could be due to limited air getting through your air intake idle speed intervention circuit error message from engine contr. you can see the please check dtc memory of central electric control ecu is the final reason of the code. |
18940 Possible Causes:
18940 vw fault code may be caused by one or more of the following:
- Exhaust Gas Recirculation Sensor B Circuit High
- O2 Sensor Heater Circuit Malfunction
- Cylinder 4 Contribution/Balance Fault
- Engine Oil Temperature Sensor Malfunction
- Reverse Input Circuit
- Clutch Position Sensor Circuit Malfunction
What To Check After Fixing 18940 Code
- Inspect all the connections tiptronic switch down (f189), open circuit / signal to b+
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns