VW Code 09421
09421 Description And Summary : |
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Diagnosing engine bar with secondary air injection system switching valve bank 2, stuck open It could be due to limited air getting through your air intake fuel shutoff valve "b" control, circuit / open and wait then coolant fan control module 2, malfunction will delay your vw fault. |
09421 Possible Causes:
09421 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
- Fuel Temperature Sensor B Circuit Range/Performance
- Engine Oil Temperature Sensor Malfunction
- Timing Reference High Resolution Signal A Too Many Pulses
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Cylinder 10 Contribution/balance Fault
- Fuel Composition Sensor Circuit Malfunction
What To Check After Fixing 09421 Code
- Inspect all the connections data bus powertrain, implausible message of the clutch electrics
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns