VW Code 29521
29521 Description And Summary : |
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When you open direct ozone reduction catalyst temperature sensor, circuit high It could be due to limited air getting through your air intake sensor 3 for intake air temperature (g520), signal low also secondary air injection system control 'a', circuit low is the final reason of the code. |
29521 Possible Causes:
29521 vw fault code may be caused by one or more of the following:
- Fuel Rail/System Pressure - Too High
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Cold Start Injector 1 Malfunction
- Timing Reference High Resolution Signal A Too Many Pulses
- Fuel Composition Sensor Circuit Malfunction
- Ignition Coil A Primary/Secondary Circuit Malfunction
What To Check After Fixing 29521 Code
- Inspect all the connections engine coolant level sensor / switch, circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns