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2023 TOYOTA CAMRY
2.5L I4•FWD•AUTOMATIC•gas•A25A-FKS
2 active safety recalls on this vehicle — view recalls
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Repairs413Labor484Torque4171Fluid7DTC1189Battery1Maintenance0Recalls2
P1140moderate severityPowertrain

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

on 2023 Toyota Camry 2.5L I4 · FWD

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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