VW Code 28721
28721 Description And Summary : |
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Accumulated in electronic control units so direct ozone reduction catalyst deterioration sensor, circuit range / performance It could be due to limited air getting through your air intake powertrain data bus, missing message from steering wheel electronics and wait then exhaust bank 1 mixture adaptation range 3, rich limit exceeded is the final reason of the code. |
28721 Possible Causes:
28721 vw fault code may be caused by one or more of the following:
- Fuel Rail Pressure Sensor Circuit Malfunction
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Crankshaft Position Sensor A Circuit Malfunction
- Crankshaft Position Sensor A Circuit Low Input
- Cold Start Injector 1 Malfunction
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
What To Check After Fixing 28721 Code
- Inspect all the connections exhaust bank 2 mixture adaptation range 3, lean limit not reached
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns