P1276 – Air/Fuel Ratio Sensor Slow Response Rich (Nissan)

Description

The ECM detected a slow rich‑side response from the AFR sensor on Bank 1.

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Symptoms

  • Poor fuel economy
  • Rough idle

Causes

  • Aging sensor
  • Exhaust restriction
  • Wiring issue

Diagnosis

  • Check AFR sensor
  • Inspect exhaust
  • Scan live data

Repair

  • Replace sensor
  • Repair wiring