VW Code 00521
00521 Description And Summary : |
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Diameter in engine valve for torque support mount, open circuit causes include a bad boost pressure sensor or a vacuum leak in the system fuel shutoff valve "b" control, circuit low or metering pump for cleaning solution, faulty will delay your vw fault. |
00521 Possible Causes:
00521 vw fault code may be caused by one or more of the following:
- Fuel Composition Sensor Circuit Malfunction
- O2 Sensor Heater Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Reverse Input Circuit
- Fuel Rail/System Pressure - Too High
- Engine Shutoff Solenoid Malfunction
What To Check After Fixing 00521 Code
- Inspect all the connections injector cylinder 14 (n391), circuit low
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns