Upstream O2 Oxygen Sensor 11787558073 0258017099 for BMW

This O2 oxygen sensor is a replacement part compatible with selected BMW vehicles. It is designed to monitor oxygen levels in the exhaust system before the catalytic converter and send accurate air-fuel ratio data to the engine control unit.

A faulty oxygen sensor may cause poor fuel economy, rough idle, unstable acceleration, increased emissions, or check engine light issues. Replacing the old or damaged sensor can help restore proper fuel mixture control, engine performance, and emissions efficiency.

Features:

• Compatible with selected BMW models
• Replacement for part numbers: 11787558073, 0258017099
• Also commonly referenced as Bosch number 17099
• Upstream / before catalytic converter oxygen sensor
• Helps maintain accurate air-fuel ratio control
• Supports fuel efficiency and stable engine performance
• Direct replacement design for easier installation
• Durable construction for long service life

Fitment Note:

Please check your original part number before ordering. This oxygen sensor is intended to replace 11787558073 / 0258017099. Depending on the vehicle model, engine, and exhaust layout, the sensor position may be listed as front, rear, upper, right side, or before catalytic converter. Please verify the OE number or confirm fitment by VIN before purchase.