What does code P1103 mean?

Q: What does code P1103 mean?

Oxygen Sensor Heating Circuit Bank 1 Sensor 1 Short To B+. P1103 on a Volkswagen means the engine control module has detected a short to battery voltage in the oxygen sensor heater circuit for Bank 1 Sensor 1, which is the upstream sensor before the catalytic converter. The computer monitors the heater control wire and sees voltage present when the heater should be off or when the control circuit is not being commanded, indicating a wiring fault rather than a lazy sensor.

DTC codes / Volkswagen codes / P1103

P1103 · VolkswagenOxygen Sensor Heating Circuit Bank 1 Sensor 1 Short To B+

P1103 on a Volkswagen means the engine control module has detected a short to battery voltage in the oxygen sensor heater circuit for Bank 1 Sensor 1, which is the upstream sensor before the catalytic converter. The computer monitors the heater control wire and sees voltage present when the heater should be off or when the control circuit is not being commanded, indicating a wiring fault rather than a lazy sensor.

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.