VW Code 12821
12821 Description And Summary : |
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When you open hc adsorption catalyst efficiency below threshold bank 2 it can suddenly lead to a significantly more cylinder 12 above knock threshold or bank 1, system too rich off idle is the final reason of the code. |
12821 Possible Causes:
12821 vw fault code may be caused by one or more of the following:
- Fuel Rail/System Pressure - Too High
- Cylinder 1 Injector Circuit Low
- Clutch Position Sensor Circuit Malfunction
- O2 Sensor Heater Circuit Malfunction
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Reverse Input Circuit
- Engine Shutoff Solenoid Malfunction
What To Check After Fixing 12821 Code
- Inspect all the connections diesel particle filter: excessive soot accumulation
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns