What does code P1108 mean?

P1108 · VolkswagenOxygen Sensor Heating Circuit Bank 2 Sensor 1 Output Too Low

P1108 on Volkswagen vehicles means the engine control module has detected that the oxygen sensor heating circuit for Bank 2 Sensor 1 is producing an output voltage that is too low, indicating the heater element or its wiring is not drawing the expected current. The computer monitors the heater circuit and flags this code when the voltage on the control circuit falls below the calibrated threshold, typically because the heater is open, shorted, or the wiring has excessive resistance.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.