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2016 LEXUS NX 300H
2.5L I4 Hybrid•AWD•CVT•hybrid
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Repairs0Labor473Torque647Fluid9DTC1921Battery1Maintenance0Recalls0
P1140moderate severityPowertrain

Air-Fuel Ratio Sensor Heater Circuit (Bank 1 Sensor 1)

on 2016 Lexus NX 300h 2.5L I4 Hybrid · AWD

What this code means

The heater circuit for the front air-fuel ratio sensor on bank 1 is malfunctioning. The sensor cannot reach operating temperature quickly, delaying accurate fuel control.

Symptoms

  • Check engine light on
  • Poor fuel economy
  • Delayed closed-loop operation

Common causes

  • Faulty A/F sensor heater
  • Blown heater fuse
  • Damaged sensor wiring
  • Faulty ECM heater driver

Diagnostic steps

  1. Check A/F sensor heater fuse
  2. Measure heater circuit resistance
  3. Inspect sensor wiring and connector
  4. Replace A/F sensor if heater failed
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