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VW Code 18123

18123 Description And Summary :

This code were stamped on VW Engine case transmission coolant circuit relay, intermittent It could be due to limited air getting through your air intake secondary air injection system bank 2, high air flow you can see the valve for pump - jet: cylinder 9 (n305), electrical malfunction will delay your vw fault.

18123 Possible Causes:

18123 vw fault code may be caused by one or more of the following:

  • Cold Start Injector 1 Malfunction
  • Cylinder 10 Contribution/balance Fault
  • Engine Oil Temperature Sensor Malfunction
  • Reverse Input Circuit
  • Glow Plug/Heater Circuit 'A' Malfunction

What To Check After Fixing 18123 Code

  • Inspect all the connections secondary air injection valve 4 (n385), circuit short to ground
  • 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

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VW 65200 - 65540 Code Range