BMW Oxygen Sensor - Bosch 17176

Ensure optimal engine performance and emissions with this genuine **Bosch 17176 Oxygen Sensor**, designed for specific BMW 3-Series models. This **Upstream Rear Oxygen Sensor** monitors exhaust gas composition for cylinders 4-6, located *before* the catalytic converter, providing critical data to the engine's control unit for precise air-fuel mixture adjustments.

Specifically engineered for **BMW 325Ci (2003-2006)** and **BMW 325i (2003-2005)** vehicles equipped with the **2.5L L6 M56 Gas engine**.

**Part Numbers:**
* Bosch Part Number: BOS-17176
* OE Cross Reference: 11787515827

Replace a failing sensor to prevent decreased fuel economy, poor engine performance, and illuminated check engine lights.