Oxygen sensor (O2S) (for unleaded fuel only)
Three-channel catalysts are used to control the content of hydrocarbons (NS), carbon monoxide (SO) and nitrogen oxides (NOx) in exhaust gases. The catalyst substance in the catalyst provokes a chemical reaction. This reaction oxidizes the HC and CO in the exhaust and converts them into harmless water vapor and carbon dioxide. The catalyst, as well as the catalyst substance, reduces NOx by converting it to nitrogen. The ECM can monitor this process with an O2S oxygen sensor). The sensor produces an output that is indicative of the amount of oxygen in the incoming exhaust stream. This is a sign of the ability of the catalyst to convert exhaust gases. The catalysis process tracking sensor works on the same principle as fuel control sensors. The main task of the sensor is to monitor the process of catalysis, but their role in fuel management is limited. If the sensor output indicates a voltage above or below 450 mV bias voltage for an extended period of time, the engine control module will smoothly adjust the fuel trim to match the fuel delivery to monitor the catalysis process.
Withdrawal
1. Disable «-» battery wire.
Note: The oxygen sensor uses a permanently attached electrode and connector. This electrode must not be removed from the oxygen sensor. Damage or removal of the electrode or connector may impair the performance of the oxygen sensor. Be careful when handling the oxygen sensor. Don't drop it.
2. Remove the oxygen sensor connector (O2S).
Note: At engine temperatures below 48°C, it may be difficult to remove the oxygen sensor. Excessive force may result in stripped threads in the exhaust manifold.
3. Carefully remove the oxygen sensor (O2S).
Installation Caution: The threads of the oxygen sensor are coated with a special non-stick compound. This composition consists of liquid graphite and glass granules. The graphite will burn off later and the glass beads will remain, making the sensor easier to remove. A new or refurbished sensor will be treated with this compound on the threads. If the sensor is removed from the engine or needs to be reinstalled, a coat of non-stick compound must be applied prior to reinstallation.
1. Coat the oxygen sensor threads with non-stick compound if necessary.
2. Install oxygen sensor (O2S) and tighten to 42 Nm.
3. Connect the oxygen sensor.
4. Connect «-» battery wire.
CO regulator (only for leaded fuel)
CO regulator (potentiometer), is typically a variable resistor regulating carbon monoxide (SO), emissions from vehicles running on leaded fuels. On these vehicles, a CO regulator is installed in place of the oxygen sensor to control the fuel injector pulse width.