Toyota 89465-08030 Oxygen Sensor

All OBD-11 equipped vehicles use engine management systems to highlight the consistency of the feedback loop between the oxygen sensor and the PCM using an oxygen or air/fuel sensor before the catalytic converter and another oxygen sensor after it to give PCM a record regarding converter efficiency. These models include three sensors; with upstream sensors located in the exhaust manifolds as well as a downstream sensor placed after the catalytic converter while the upstream sensors differ with region and year, air/fuel sensors are used in models produced after 2001. The principle of oxygen sensors working as galvanic batteries is operationally linked with the PCM which controls the air/fuel mix depending on the voltage output; the effectiveness is related to electrical connections, no blockage to air to the sensor, the right operating temperature, and if the fuel used is unleaded. If the oxygen sensor provides a stable voltage less than 1.45 volts as RPM increases when the engine has normal temperature, PCM will store a trouble code. In the event of administration failure of the different sensors, the PCM switches to open loop control of fuel. Likewise, the air/fuel sensor is also an interface between the PCM as it reports a variable voltage which is proportional to the AFM, similar to the function of an oxygen sensor but first needs warm up. Measures that should not be taken during servicing of the sensor include; damage of the attached pigtail and an electrical connector, exposure of the sensor to contaminants, and use of cleaning solvents on the sensor part, and proper handling of the sensor with integrity.

Disconnect the cable from the negative terminal of the battery.