25327358 Auto Oxygen Sensor 2-Wire Non-Heated M18x1.5 For Chevrolet Sail Buick Sail Wuling Great Wall

The 25327358 non-heated zirconia oxygen sensor (Lambda / O2 sensor) is engineered for first-generation single-point EFI systems used on Chevrolet Sail, Buick Sail and a wide range of Chinese light commercial vehicles. It measures the oxygen content of the exhaust stream and delivers a 0.1–0.9 V switching signal to the ECU, enabling closed-loop fuel control.

Because the sensor has no internal heater, the ceramic element is brought up to operating temperature by exhaust gas heat alone — the original design used on single-point injection applications. The body is a stainless-steel shell with a zirconia ceramic element and a platinum electrode, protected against contamination by a spinel coating.

• Two wires: one signal wire and one signal ground; no heater circuit is present, so the plug houses two pins only.
• Signal output: approximately 0.6–1.0 V under rich conditions, falling towards 0.1 V under lean conditions; the ECU switches fuel trim as the signal crosses the 0.45 V threshold.
• Direct-fit: oval 2-pin plug, no cutting or splicing required.
• Installation position: confirm against the original sensor position on your vehicle. Upstream (pre-catalyst) and downstream (post-catalyst) sensors are not interchangeable on most applications — always compare connector shape, pin count and thread before ordering.
• Torque: tighten to the vehicle manufacturer's specification (typically 40–55 N.m on an M18 x 1.5 boss). Do not use silicone-based sealant anywhere near the sensor.

Cross-reference numbers are listed for identification only. Always verify physical fitment — connector shape, pin count and thread size — against your original part before installation.

Vehicle list is compiled from aftermarket catalogue cross-references and is indicative only. Please confirm by OE number and by comparing the original sensor before ordering.