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VW Code 15521

15521 Description And Summary :

When you open nox sensor bank 2, circuit intermittent It could be due to limited air getting through your air intake data bus powertrain, missing message from steering angle sensor or fuel rail sensor (g401), short to ground will delay your vw fault.

15521 Possible Causes:

15521 vw fault code may be caused by one or more of the following:

  • Cold Start Injector 1 Malfunction
  • O2 Sensor Heater Circuit Malfunction
  • Manifold Absolute Pressure/Barometric Pressure Circuit High Input
  • Fuel Rail Pressure Sensor Circuit Malfunction
  • Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
  • Crankshaft Position Sensor A Circuit Low Input
  • Cylinder 1 Injector Circuit Low

What To Check After Fixing 15521 Code

  • Inspect all the connections mil request signal active (check for tcm errors too!)
  • Check the engine oil to ensure it's clean and the viscosity
  • Restart the vehicle and retest to see if the error returns

VW 001 - 196 Code Range

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range