Rear oxygen sensor for Toyota, Weizmann (imported), Daihatsu, FAW

Rear oxygen sensor for Toyota, Weizmann (imported), Daihatsu, FAW Jilin

Description of the product 

OE NO.: 89465-12880 /89465-BZ150

Applicable Brand: Toyota, Weizmann (imported), Daihatsu, FAW Jilin

Model: non

The core function of the rear oxygen sensor

Monitoring the efficiency of three-way catalytic converters

The rear oxygen sensor is installed behind the three-way catalyst to detect the oxygen concentration in the purified exhaust gas and compare it with the data from the front oxygen sensor.

If the two data are close, it indicates that the catalyst may fail and cannot effectively purify harmful substances (such as CO, HC, NOx) in the exhaust gas. At this time, a fault code will be triggered to prompt maintenance.
 

Assist ECU in optimizing air-fuel ratio

Although the front oxygen sensor is the main basis for adjusting fuel injection quantity, the feedback signal from the rear oxygen sensor can further calibrate the air-fuel ratio, ensuring more complete combustion and reducing emission pollution.

For example, when the rear oxygen sensor detects abnormal oxygen concentration, the ECU may fine tune the fuel injection strategy to compensate for the impact of reduced catalytic converter performance.
 

Environmental Protection and Fuel Consumption Control

The rear oxygen sensor ensures the normal operation of the three-way catalyst, directly reducing harmful emissions in the exhaust gas and meeting environmental standards. If it fails, it may lead to a 10% -20% increase in fuel consumption and excessive exhaust emissions.
 

Overview of Working Principle

The rear oxygen sensor is based on the Nernst principle and generates a voltage signal by sensing the difference in oxygen concentration through zirconia ceramic components. Its working temperature needs to reach about 350 ℃ to accurately output data, and the signal is transmitted to the ECU for system adjustment.
 

Collaboration with other sensors

Difference from front oxygen sensor: The front oxygen sensor directly controls the fuel injection quantity, while the rear oxygen sensor focuses on evaluating the catalytic converter efficiency.
 

Fault impact: The malfunction of the rear oxygen sensor may not immediately affect power, but if left untreated for a long time, it can damage the catalyst and increase maintenance costs.

What can we provide for auto parts?

Gestar not only provides customers with various types and brands of used cars, but also relies on China's strong supply chain advantages to provide customers with various new and second-hand auto parts.

Pls contact us and provide VIN or OE number for requiring any kinds of auto parts!