What does code P1155 mean on Lexus vehicles?
A malfunction has been detected in the heater circuit of the air/fuel ratio sensor, preventing proper sensor operation.
OBD-II Code Lexus
P1155 — Lexus — Air/Fuel Ratio Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
A malfunction has been detected in the heater circuit of the air/fuel ratio sensor, preventing proper sensor operation.
Common symptoms
- Check engine light
Possible causes
- Open or short circuit in heater circuit
Initial recommendation
Check heater resistance, wiring and power supply.
Safety notice
This information is for guidance only. Brand-specific codes may vary by model, year, engine, transmission and vehicle configuration. It does not replace a physical inspection or diagnosis by a qualified mechanic. If the vehicle is unsafe to operate, avoid driving it and seek professional inspection.
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