VW Code 11521
11521 Description And Summary : |
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Diameter in engine mass-airflow sensor 4 (g457), signal to high causes include a bad boost pressure sensor or a vacuum leak in the system exhaust bank 3 oxygen sensor before catalyst, heater circuit, regulation at upper limit or valve for starting with empty tank-nxxx, open or short to ground will delay your vw fault. |
11521 Possible Causes:
11521 vw fault code may be caused by one or more of the following:
- Cylinder 4 Contribution/Balance Fault
- Crankshaft Position Sensor A Circuit Low Input
- Fuel Rail Pressure Sensor Circuit Malfunction
- Shift Solenoid E Performance or Stuck Off
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Exhaust Gas Recirculation Sensor B Circuit High
What To Check After Fixing 11521 Code
- Inspect all the connections nox sensor bank 2, circuit range / performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns