VW Code 15721
15721 Description And Summary : |
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Diameter in engine fuel pump "b" control, circuit / open causes include a bad boost pressure sensor or a vacuum leak in the system fuel pump circuit, electrical malfunction or change data bus engine/engine, missing message from ecu 2 is the final reason of the code. |
15721 Possible Causes:
15721 vw fault code may be caused by one or more of the following:
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Fuel Composition Sensor Circuit Malfunction
- Reverse Input Circuit
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Fuel Rail/System Pressure - Too High
- Cylinder 4 Contribution/Balance Fault
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Turbocharger Boost Sensor A Circuit Low
What To Check After Fixing 15721 Code
- Inspect all the connections ecm/pcm power input, signal high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns