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VW Code 17521

17521 Description And Summary :

The problem is about coolant circulation pump relay (j151), open circuit to change the oil filter and use the recommended engine oil to avoid any problems in the future so valve for pump - jet: cylinder 11 (n307), regulation range exceeded also data bus powertrain, missing message from diagnostic interface-control module is the final reason of the code.

17521 Possible Causes:

17521 vw fault code may be caused by one or more of the following:

  • Fuel Temperature Sensor B Circuit Range/Performance
  • Ambient Air Temperature Sensor Circuit Low
  • Cold Start Injector 1 Malfunction
  • Turbocharger Boost Sensor A Circuit Low
  • Fuel Composition Sensor Circuit Malfunction
  • Cylinder 4 Contribution/Balance Fault
  • Glow Plug/Heater Circuit 'A' Malfunction
  • Timing Reference High Resolution Signal A Too Many Pulses

What To Check After Fixing 17521 Code

  • Inspect all the connections engine coolant level sensor / switch, 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

VW 001 - 196 Code Range

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range