An O2 sensor spacer is a device that is installed between the oxygen sensor and the exhaust pipe. The purpose of the spacer is to create a gap between the two surfaces so that the oxygen sensor can accurately measure the amount of oxygen in the exhaust gas. There are many different designs of O2 sensor spacers, but they all serve the same basic function.
The most common type of O2 sensor spacer is made from stainless steel or aluminum. These materials are resistant to corrosion and will not degrade over time like other materials. The spacers are usually available in a variety of sizes to fit different types of exhaust pipes.
To install an O2 sensor spacer, first remove the old oxygen sensor from its location on the exhaust pipe. Next, clean both surfaces with a wire brush to remove any dirt or debris. Then, place the spacer onto the exhaust pipe and reinstall the oxygen sensor. Make sure that both surfaces are tight against each other to create a good seal.
Once you have installed an O2 sensor spacer, it is important to monitor your vehicle's performance closely. If you notice any decrease in fuel economy or engine power, have your vehicle inspected by a qualified mechanic as soon as possible.