P1110 — Volkswagen — Oxygen Sensor Heating Circuit Bank 2 Sensor 2 Short To B+

P1110 (Volkswagen): Oxygen Sensor Heating Circuit Bank 2 Sensor 2 Short To B+ — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Oxygen Sensor Heating Circuit Bank 2 Sensor 2 Short To B+. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Check Engine light illuminated
  • Increased fuel consumption
  • Rough engine idle
  • Failure of emissions inspection
  • Poor engine performance

Possible causes

  • Faulty oxygen sensor heater element
  • Short circuit to battery voltage in sensor wiring
  • Damaged or corroded oxygen sensor harness connector
  • Blown fuse for oxygen sensor heater circuit
  • Faulty Engine Control Module (ECM)

What to check

  • Inspect the oxygen sensor connector for moisture or corrosion
  • Measure supply voltage at the heater circuit connector using a multimeter
  • Check the sensor heating element resistance to identify internal shorts
  • Test the wiring harness for continuity and shorts to B+ from the sensor to the ECM
  • Verify the fuse and relay responsible for the heater circuit supply