P1275 – Air/Fuel Ratio Sensor Lean Shift (Nissan)

Description

The ECM detected a lean shift condition in the air/fuel ratio sensor on Bank 1.

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

  • Lean mixture
  • Hesitation
  • Poor acceleration

Causes

  • Faulty AFR sensor
  • Exhaust leak
  • Wiring issue

Diagnosis

  • Check AFR sensor
  • Inspect exhaust
  • Scan live data

Repair

  • Replace sensor
  • Repair wiring