BMW 5 Series Rear Oxygen Sensor 11787544655 0258006809 Optimized emissions, more fuel-efficient

Specifically designed for 2003-2010 BMW 5 Series (E60/E61) with N52, N54 and M54 engines (including 520i, 525i, 530i and 535i) and compatible with some 2006-2013 X3 (E83) and X5 (E70) models. This rear oxygen sensor (OEM 11787544655 / 0258006809) monitors exhaust oxygen content after the catalytic converter and adjusts air-fuel ratio in real time to optimize combustion, reducing emissions and improving fuel economy. Replacement difficulty medium; raise the vehicle and disconnect electrical connector; use dedicated oxygen sensor socket to avoid thread damage. Ensure engine is cooled before installation and check wiring for aging. As an in-house brand product, this sensor offers a high cost-performance OE replacement, suitable for wholesalers and repair shops for stable supply and quick turnover.