Contents: Action ⇊ Removal and installation ⇊
Action
The oxygen sensor is installed on the exhaust manifold. It is used to determine the concentration of O2 in the exhaust gas. If the ratio in the fuel mixture is different from the ideal, for example, it is leaner (i.e. there is too much air), then the exhaust gas contains a large amount of oxygen. If it is richer than ideal, then there is almost no oxygen left in the exhaust gas. The oxygen sensor converts information about the O2 content in the exhaust gas into a weak electrical signal that is sent to the computer and used to calculate the current electrical feedback pulses. By acting on various components of the engine system, the on-board computer can change the ratio in the air-fuel mixture, bringing it to the ideal composition: 14.7 parts air to 1 part fuel. When the ratio is ideal, its efficiency is highest, and the exhaust is minimal.
Removal and installation
The sensors can be unscrewed from the manifold or exhaust pipe. Make sure the exhaust system is cool to avoid serious burns during installation. Remove the electrical contact near the sensor. Use a special chuck to remove and install the sensor. These chucks have a special groove in the wall to avoid damaging the wiring. They should also be well matched to the size of the sensor. Keep the wrench straight to avoid bending the sensor and stripping the threads. To install the sensor, coat the threads with an anti-seize compound. Be very careful not to let the compound or petroleum products get on the tip of the sensor, otherwise its operation will be distorted by contamination. Install the sensor and tighten it to a torque of 45 Nm. Connect the wires to the sensor.