P1142 – Lambda Sensor Plausibility Fault (BMW)

Description

P1142 BMW indicates the lambda sensor reading is not plausible.

Want to confirm the real cause of this fault code?

A high-quality OBD2 scanner gives you live data, fuel trims, sensor readings and freeze-frame information — exactly what you need to verify the root cause of this code with confidence.

View Recommended Scanners

Symptoms

  • Poor acceleration
  • Hesitation
  • Rough idle

Causes

  • Sensor failure
  • Exhaust leak
  • Wiring issue

Diagnosis

  • Check lambda readings
  • Inspect exhaust
  • Check wiring

Repair

  • Replace sensor
  • Fix exhaust leak
  • Repair wiring