Where is the automotive three-way catalytic converter located?

1 Answers
StDakota
07/30/25 2:37am
The three-way catalytic converter is located on the exhaust manifold, which is the header section of the exhaust pipe. The function of the three-way catalytic converter is to purify exhaust gases, as this component can reduce the content of toxic and harmful substances in vehicle emissions. Three-way catalytic converter failure: It will affect the vehicle's exhaust emissions exceeding standards, which may prevent the vehicle from passing annual inspections smoothly; it is necessary to replace the three-way catalytic converter with a new one immediately, and it is essential to choose an original equipment manufacturer (OEM) product. Working principle: When high-temperature exhaust gases pass through the purification device, the purifying agents in the three-way catalytic converter enhance the activity of three gases: CO, HC, and NOx. Oxygen sensors: The oxygen sensor in front of the three-way catalytic converter is called the front oxygen sensor, while the one behind it is called the rear oxygen sensor. The primary function of the front oxygen sensor is to detect the oxygen content in the exhaust gases and then send the signal back to the ECU. The ECU can adjust the engine's air-fuel ratio based on this data. The main function of the rear oxygen sensor is to check whether the three-way catalytic converter has failed. If the data transmitted by the front and rear oxygen sensors to the ECU are similar, it indicates that the three-way catalytic converter has failed.
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