P1333 – Air/Fuel Ratio Sensor Heater Bank 2 (Nissan)

Description

The ECM detected a heater malfunction in the AFR sensor on Bank 2.

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Symptoms

  • Poor warm‑up
  • Poor fuel economy

Causes

  • Heater open circuit
  • Wiring issue
  • Sensor failure

Diagnosis

  • Check heater resistance
  • Inspect wiring
  • Scan live data

Repair

  • Replace sensor
  • Repair wiring