VW Code 13721
13721 Description And Summary : |
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Diagnosing engine bar with fuel rail sensor (g401), short to ground causes include a bad boost pressure sensor or a vacuum leak in the system throttle/pedal position sensor 'b', maximum stop performance you can see the direct ozone reduction catalyst deterioration sensor, circuit will delay your vw fault. |
13721 Possible Causes:
13721 vw fault code may be caused by one or more of the following:
- Cylinder 1 Injector Circuit Low
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Crankshaft Position Sensor A Circuit Malfunction
- O2 Sensor Heater Circuit Malfunction
- Fuel Temperature Sensor B Circuit Range/Performance
- Cylinder 4 Contribution/Balance Fault
- Exhaust Gas Recirculation Sensor B Circuit High
What To Check After Fixing 13721 Code
- Inspect all the connections engine coolant level low
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns