The sensor measures the oxygen content in the exhaust gases and converts the measured value into a signal voltage that is supplied to the engine electronic control unit. Using the sensor signals, the ECU controls the fuel injection in such a way as to obtain the calculated composition of the air-fuel mixture.
If the oxygen concentration sensor is defective, the toxicity of the exhaust gases may increase dramatically.
WARNINGS: Because the Oxygen Control Sensor is a key component of the aftertreatment system, only high quality replacement parts should be used. To avoid damage, the sensor must only be removed and installed using the appropriate tools. If the sensor is reused, the threads must be treated with special mounting paste. When doing this, avoid getting paste on the protective tube, as this can lead to malfunctions of the sensor. New oxygen sensors from leading manufacturers are pre-treated with paste. Finally, the tightening torque specified by the manufacturer, which is usually 40-60 Nm, must be observed. The oxygen concentration sensor requires careful handling to avoid mechanical damage (for example, due to falling). Because the sensor draws reference air through the housing, it cannot be treated with contact spray or lubricant. When routing the wiring harness, avoid contact with hot engine parts and moving parts.
You will need a split wrench «at 22».
1. Disconnect the wire from the terminal «minus» battery.
2. Disconnect the block of the harness of the control oxygen concentration sensor by squeezing the clamp of its fastening.
3. Unscrew the sensor from the collector.
4. Install the oxygen concentration control sensor in the reverse order of removal.