The sensor measures the oxygen content in the exhaust gases and converts the measured value into a signal voltage, which is fed to the electronic engine control unit. Using the sensor signals, the ECU controls the fuel injection in such a way as to obtain the calculated composition of the fuel-air mixture.
If the oxygen sensor is faulty, exhaust emissions may increase dramatically.
WARNINGS: Since the oxygen sensor is a key component of the exhaust gas cleaning system, only high-quality spare parts must be used. To avoid damage, the sensor must be removed and installed only with the appropriate tools. If the sensor is reused, the threads must be treated with a special assembly paste. Avoid getting paste on the protective tube, as this may cause malfunctions of the sensor. New oxygen sensors from leading manufacturers are pre-treated with paste. Finally, the tightening torque specified by the manufacturer must be observed, usually 40-60 Nm. Oxygen sensors require careful handling to avoid mechanical damage (for example, due to a fall). Since the sensor draws reference air through the housing, it must not 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 22 mm socket wrench.
1. Disconnect the wire from the negative terminal of the battery.
2. Disconnect the oxygen concentration sensor control harness connector by squeezing its mounting clip.
3. Unscrew the sensor from the exhaust manifold.
4. Install the oxygen concentration control sensor in the reverse order of removal.