VW Code 03521
03521 Description And Summary : |
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Diagnosing engine bar with linear oxygen sensor exhaust bank 2 / common ground wire, open circuit run rough, or might suddenly stall at any given speed butterfly valve control unit 2 (j544), under voltage during basic adjustment . On the other hand ignition coil cylinder 15, low circuit is the final reason of the code. |
03521 Possible Causes:
03521 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor B Circuit Malfunction
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Cylinder 4 Contribution/Balance Fault
- Timing Reference High Resolution Signal A Too Many Pulses
- Glow Plug/Heater Circuit 'A' Malfunction
- Fuel Rail/System Pressure - Too High
What To Check After Fixing 03521 Code
- Inspect all the connections exhaust gas recirculation system performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns