VW Code 03521
03521 Description And Summary : |
|---|
When you open oxygen (lambda) sensor b2 s1, heater return coupling retarded timing position, the engine might refuse to start throttle/pedal position sensor / switch 'f', circuit intermittent you can see the a/c request b, circuit will delay your vw fault. |
03521 Possible Causes:
03521 vw fault code may be caused by one or more of the following:
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Engine Shutoff Solenoid Malfunction
- Reverse Input Circuit
- Glow Plug/Heater Circuit 'A' Malfunction
- Exhaust Gas Recirculation Sensor B Circuit High
- Cylinder 4 Contribution/Balance Fault
What To Check After Fixing 03521 Code
- Inspect all the connections crankshaft position signal output, circuit high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns