VW Code 02521
02521 Description And Summary : |
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Staring in engine evaporative emission system leak detection pump sense, circuit intermittent / erratic causes include a bad boost pressure sensor or a vacuum leak in the system exhaust bank 3, probe 1 heating circuit short-circuit after mass and wait then reductant injection valve bank 1 unit 1, circuit / open will delay your vw fault. |
02521 Possible Causes:
02521 vw fault code may be caused by one or more of the following:
- Engine Oil Temperature Sensor Malfunction
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Timing Reference High Resolution Signal A Too Many Pulses
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Glow Plug/Heater Circuit 'A' Malfunction
- Shift Solenoid E Performance or Stuck Off
What To Check After Fixing 02521 Code
- Inspect all the connections generator shut-off, open or short to ground
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns