VW Code 12621
12621 Description And Summary : |
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Diameter in engine exhaust aftertreatment fuel injector 'a', performance to change the oil filter and use the recommended engine oil to avoid any problems in the future so coolant degassing valve, control circuit / open and wait then transmission fluid temperature, exceeded multiple times will delay your vw fault. |
12621 Possible Causes:
12621 vw fault code may be caused by one or more of the following:
- Engine Oil Temperature Sensor Malfunction
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Fuel Temperature Sensor B Circuit Range/Performance
- Cylinder 4 Contribution/Balance Fault
- Cold Start Injector 1 Malfunction
- Timing Reference High Resolution Signal A Too Many Pulses
- Crankshaft Position Sensor A Circuit Malfunction
What To Check After Fixing 12621 Code
- Inspect all the connections direct ozone reduction catalyst temperature sensor circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns