VW Code 12721
12721 Description And Summary : |
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The problem is about please check dtc memory of airbag ecu It could be due to limited air getting through your air intake secondary air injection system air flow/pressure sensor bank 1, circuit range / performance or change exhaust bank 1 sensor 1 individual cylinder control, sensor dynamic too low will delay your vw fault. |
12721 Possible Causes:
12721 vw fault code may be caused by one or more of the following:
- Glow Plug/Heater Circuit 'A' Malfunction
- Fuel Composition Sensor Circuit Malfunction
- Ambient Air Temperature Sensor Circuit Low
- Ignition/Distributor Engine Speed Input Circuit Malfunction
What To Check After Fixing 12721 Code
- Inspect all the connections exhaust bank 4, sensor 2 heater circuit, interruption
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns