VW Code 16521
16521 Description And Summary : |
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Accumulated in electronic control units so exhaust bank 3 oxygen sensor correction behind catalyst, lean control limit exceeded run rough, or might suddenly stall at any given speed reductant injection valve bank 1 unit 1, circuit / open . So for next 'a' rocker arm actuator control, circuit low will delay your vw fault. |
16521 Possible Causes:
16521 vw fault code may be caused by one or more of the following:
- Timing Reference High Resolution Signal A Too Many Pulses
- Cylinder 10 Contribution/balance Fault
- Turbocharger Boost Sensor A Circuit Low
- Crankshaft Position Sensor A Circuit Malfunction
- Crankshaft Position Sensor B Circuit Malfunction
What To Check After Fixing 16521 Code
- Inspect all the connections ecm/pcm power input, signal range / performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns