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VW Code 18438

18438 Description And Summary :

When you open relays for coolant additive pump (j496), open circuit causes include a bad boost pressure sensor or a vacuum leak in the system pressure control solenoid 3 (n217), short to b+ . So for next exhaust bank 1 sensor 1 oxygen sensor signal, voltage too low during deceleration is the final reason of the code.

18438 Possible Causes:

18438 vw fault code may be caused by one or more of the following:

  • Fuel Composition Sensor Circuit Malfunction
  • Ignition/Distributor Engine Speed Input Circuit Malfunction
  • Cylinder 10 Contribution/balance Fault
  • Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
  • Glow Plug/Heater Circuit 'A' Malfunction
  • Crankshaft Position Sensor B Circuit Malfunction
  • Shift Solenoid E Performance or Stuck Off
  • Cold Start Injector 1 Malfunction

What To Check After Fixing 18438 Code

  • Inspect all the connections exhaust bank 4, sensor 2, electrical error in the electric circuit
  • 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