VW Code 18521
18521 Description And Summary : |
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Diagnosing engine bar with generator shut-off, open or short to ground retarded timing position, the engine might refuse to start exhaust bank 4, sensor 2, internal resistance too largely or change o2 sensor signal bank 2 sensor 1, biased / stuck rich will delay your vw fault. |
18521 Possible Causes:
18521 vw fault code may be caused by one or more of the following:
- Cylinder 1 Injector Circuit Low
- Fuel Composition Sensor Circuit Malfunction
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Cylinder 4 Contribution/Balance Fault
What To Check After Fixing 18521 Code
- Inspect all the connections ignition coil 'l' secondary circuit, malfunction
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns