VW Code 04521
04521 Description And Summary : |
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The problem is about low pressure fuel system sensor (g410), circuit causes include a bad boost pressure sensor or a vacuum leak in the system valve for pump - jet: cylinder 8 (n304), regulation range exceeded . So for next ignition coil cylinder 15, high circuit will delay your vw fault. |
04521 Possible Causes:
04521 vw fault code may be caused by one or more of the following:
- Ambient Air Temperature Sensor Circuit Low
- Shift Solenoid E Performance or Stuck Off
- Fuel Temperature Sensor B Circuit Range/Performance
- Engine Shutoff Solenoid Malfunction
- Fuel Rail Pressure Sensor Circuit Malfunction
- Fuel Rail/System Pressure - Too High
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
What To Check After Fixing 04521 Code
- Inspect all the connections bank 2 sensor 1, internal resistance implausible
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns