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P1135 fault code: what it means

P1135: A/F sensor heater circuit, bank 1 sensor 1 on older Lexus models. The front sensor heater has failed.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. failed A/F sensor heater
  2. blown heater fuse
  3. sensor wiring fault

P1135 by make

Lexus

A/F sensor heater circuit, bank 1 sensor 1 on older Lexus models. The front sensor heater has failed.

Usual causes: failed A/F sensor heater; blown heater fuse; sensor wiring fault

Toyota

A/F sensor heater circuit fault, bank 1 sensor 1 (older Toyota code). Very common; the sensor heater has failed.

Usual causes: failed A/F sensor heater; blown A/F heater fuse; sensor wiring fault

Not sure what P1135 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.