392103LNB0 Hyundai / KIA SENSORASSY-OXYGENR, Price: 140.25$, Weight: 0.1kg

Rear Oxygen Sensor Assembly (O2 Sensor)

This rear oxygen sensor is a key feedback part in the exhaust system. It helps the ECU verify how well the catalytic converter is cleaning exhaust gases. When it’s working right, the engine stays efficient, emissions stay low, and the warning light stays off ✅.

Why this part is needed

Modern engines must control fuel and monitor catalyst performance all the time. The rear O2 sensor provides the “after-catalyst” reading, allowing the system to confirm that the converter is doing its job and to keep the vehicle within emission limits.

How it works

The sensor sits in the exhaust stream and measures oxygen content in the gases. It generates a signal voltage that changes with oxygen level. The ECU compares this value to expected patterns to detect catalyst efficiency and mixture issues. Most units use an internal heater so it reaches operating temperature quickly ⚡.

What happens if it’s broken

A failing sensor can trigger a check engine light, cause failed emissions tests, and lead to incorrect catalyst monitoring. You may notice rough running, higher fuel use, or sluggish response. If ignored too long, it can contribute to converter stress and extra repair costs ?.

Compatible Models

• Outlander<Phev>