P1135 — Lexus — Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

P1135 (Lexus): Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1 — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Rough cold running.

Possible causes

  • Failed heater or damaged wiring.

What to check

  • Inspect connectors and the heater fuse.