P1106 — Volkswagen — Oxygen Sensor Circuit Bank 2 Sensor 1 Voltage Too Low/Air Leak

P1106 (Volkswagen): Oxygen Sensor Circuit Bank 2 Sensor 1 Voltage Too Low/Air Le… — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Oxygen Sensor Circuit Bank 2 Sensor 1 Voltage Too Low/Air Leak. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Illuminated Check Engine light
  • Poor engine performance and power loss
  • Increased fuel consumption
  • Rough engine idle
  • Exhaust emissions exceeding limits

Possible causes

  • Faulty oxygen sensor (Bank 2 Sensor 1)
  • Air leak in the intake or exhaust system
  • Corroded or damaged wiring harness to the sensor
  • Open or short circuit in the sensor circuit
  • Faulty electrical connection at the sensor connector

What to check

  • Inspect the oxygen sensor wiring for heat damage or fraying
  • Perform a smoke test to identify air leaks in the intake and exhaust
  • Measure sensor signal voltage using a multimeter or scan tool
  • Examine the sensor connector pins for corrosion or bent terminals
  • Verify integrity of the sensor ground and reference circuits