P1279 – Air/Fuel Ratio Sensor Range/Performance (Nissan)

Description

The ECM detected an AFR sensor signal outside the expected range.

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Symptoms

  • Poor fuel economy
  • Hesitation

Causes

  • Faulty sensor
  • Exhaust leak
  • Wiring issue

Diagnosis

  • Check AFR sensor
  • Inspect exhaust
  • Scan live data

Repair

  • Replace sensor
  • Repair wiring

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