VW Code 28821
28821 Description And Summary : |
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Staring in engine exhaust aftertreatment fuel injector 'a', performance It could be due to limited air getting through your air intake turbocharger boost control position sensor, circuit intermittent and wait then secondary air injection valve 4 (n385), circuit electrical malfunction will delay your vw fault. |
28821 Possible Causes:
28821 vw fault code may be caused by one or more of the following:
- Turbocharger Boost Sensor A Circuit Low
- Crankshaft Position Sensor A Circuit Low Input
- Crankshaft Position Sensor B Circuit Malfunction
- Engine Oil Temperature Sensor Malfunction
- Cylinder 10 Contribution/balance Fault
What To Check After Fixing 28821 Code
- Inspect all the connections intake manifold tuning valve (bank 1), stuck closed
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns