Air/Fuel (A/F) Ratio Sensor (ES300 & RX300)
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Lexus SC 430, 2003 Lexus RX 300, 2003 Lexus LX 470, 2003 Lexus LS 430, and 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Air/Fuel (A/F) ratio sensor may also be referred to as air/fuel sensor.
The heated A/F sensor monitors exhaust gas oxygen content and delivers an input signal to Engine Control Module (ECM). ECM uses input signal to control air/fuel ratio.