Where is the oxygen sensor located in a car?
2 Answers
Oxygen sensors can be divided into two types, front and rear, both installed on the engine exhaust pipe. The front oxygen sensor is located before the three-way catalytic converter and serves to monitor the engine's combustion conditions. The rear oxygen sensor is positioned after the three-way catalytic converter and functions to detect oxygen levels post-catalyst. Below is an introduction to automotive oxygen sensors: The automotive oxygen sensor is a crucial feedback sensor in the electronic fuel injection engine control system. It plays a key role in controlling vehicle exhaust emissions, reducing environmental pollution, and improving fuel combustion quality in the engine. Oxygen sensors come in two types: zirconia (ZrO2) and titania (TiO2).
The oxygen sensor is typically found in the exhaust pipe. Specifically, it is installed near the exhaust manifold or the catalytic converter, with some vehicles having one in the front and one in the back. Last time I was helping out at the repair shop, I saw the technician remove exhaust components to measure the data line. The front sensor is closer to the engine and is responsible for monitoring untreated exhaust gases; the rear sensor is located behind the catalytic converter to check the purification effect. This device looks like a small probe inserted into the exhaust pipe, connected to the vehicle's computer with copper wires. If you're replacing it yourself, remember to wait for the exhaust pipe to cool down, and be careful not to break the wire when unplugging the connector—the position can indeed be a bit tricky.
