Manufacturer-specific code

This code means different things on different makes. Find yours below.

• Toyota, Lexus

  Air/fuel ratio sensor circuit response (bank 1 sensor 1)

  The front air/fuel ratio sensor reacts too slowly to changes in the mixture.

  Likely causes, most likely first

  1. 01Aged air/fuel ratio sensor
  2. 02Exhaust leak before the sensor
  3. 03Intake air leak
  4. 04Wiring or connector fault

  Severity: Caution: get it checked soon · DIY with tools and some experience