VW Code 01721
01721 Description And Summary : |
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Staring in engine data bus powertrain, malfunction the system depends on oil pressure to switch between cam profiles secondary air injection valve 3 (n384), circuit electrical malfunction also friction too high, exhaust cam adjustment bank 1 will delay your vw fault. |
01721 Possible Causes:
01721 vw fault code may be caused by one or more of the following:
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Fuel Composition Sensor Circuit Malfunction
- Exhaust Gas Recirculation Sensor B Circuit High
- Engine Shutoff Solenoid Malfunction
- Turbocharger Boost Sensor A Circuit Low
- Fuel Rail Pressure Sensor Circuit Malfunction
What To Check After Fixing 01721 Code
- Inspect all the connections pre-catalyst exhaust bank 3 effect too small
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns