P1274 – Air/Fuel Ratio Sensor Rich Shift (Nissan)

Description

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

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Symptoms

  • Rich mixture
  • Poor fuel economy

Causes

  • Faulty sensor
  • Injector leak
  • Wiring issue

Diagnosis

  • Check AFR sensor
  • Inspect injectors
  • Scan live data

Repair

  • Replace sensor
  • Repair wiring