0258017231 Regulating Oxygen (O2) Sensor — Direct Fit for BMW 5 Series, 7 Series, X3 and xDrive Models Compatible OEM: 11787589139 Why you need this part Restores correct airfuel mixture control by providing accurate oxygen readings to the engine control unit (ECU). Solves common symptoms of a failing O2 sensor: illuminated check engine light, reduced fuel economy, rough idle, increased emissions, and poor throttle response. Directfit replacement designed to match original equipment specifications for reliable operation and straightforward installation. Key benefits Precise regulation: Provides timely, accurate oxygen feedback so the ECU can optimize combustion for performance and economy. Emissions compliance: Helps reduce harmful exhaust emissions by allowing the engine to maintain the correct mixture. Quick diagnostics and : Replacing a faulty sensor is a common that can eliminate diagnostic trouble codes and restore drivability. Built for durability: Manufactured to withstand exhaust temperatures and corrosive conditions common in vehicle exhaust systems. Core features and attributes Function: Regulating oxygen (O2) sensor that measures exhaust oxygen content and sends voltage signals to the ECU for airfuel ratio adjustment. Fitment and compatibility: Intended for use with BMW models listed in the title — 5 Series, 7 Series, X3, and specific engines and trims such as 28i, 523i, 528i, 530i, 730i Li; chassis references F10, F02, F11; compatible with xDrive variants where specified. OEM reference 11787589139 for verification. Form factor: Directreplacement sensor designed for original mounting location and electrical connection to ensure a proper fit (verify connector and thread fitment against vehicle OEM specification before ). Performance: Engine management support for stable idling, improved throttle response, and optimized fuel consumption when installed and operating correctly. Typical applications / use cases a failed upstream/downstream oxygen sensor on a BMW 528i F10 showing a P013x/P014x fault, restoring proper fuel trim and eliminating the check engine light. Routine maintenance or preventative replacement during exhaust or catalytic converter service on 5 Series or 7 Series vehicles to maintain emissions performance and avoid limpmode issues. of X3 xDrive models experiencing poor fuel economy or rough running caused by an aging or contaminated O2 sensor. Installation and compatibility notes Confirm vehicle year, engine code, and OEM part number (11787589139) before ordering to ensure correct fitment. Professional installation recommended if you do not have experience with exhaust components or vehicle diagnostics. Proper torque and sealing are important to prevent exhaust leaks and ensure accurate readings. After installation, clear fault codes and perform a road test or diagnostic scan to confirm sensor operation and restored system performance. This part is offered as a direct replacement oxygen sensor (0258017231) compatible with the BMW models and OEM reference listed. Verify fitment against your vehicle's VIN or existing part number for a precise match.