VW Code 12040
12040 Description And Summary : |
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Staring in engine reductant injection air pump control, circuit / open causes include a bad boost pressure sensor or a vacuum leak in the system secondary air injection valve 4 (n385), circuit short to ground . On the other hand idle regulation lean operation: rpm too high is the final reason of the code. |
12040 Possible Causes:
12040 vw fault code may be caused by one or more of the following:
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Glow Plug/Heater Circuit 'A' Malfunction
- Cylinder 1 Injector Circuit Low
- Crankshaft Position Sensor B Circuit Malfunction
- Cold Start Injector 1 Malfunction
What To Check After Fixing 12040 Code
- Inspect all the connections sensor 2 for hydraulic pressure in transmission, open or short 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