BMW 525Li E60 Oxygen Sensor 11787544655, compatible with 0258006809, restores optimal air-fuel ratio

BMW 525Li E60 (2003-2010) and some N52/N54 engines (including 520i, 525i, 530i, 535i) rear oxygen sensor (OEM 1178-7544-655) uses zirconia sensor element with stainless steel corrosion-resistant housing; durability ≥90% of OE. Detects exhaust oxygen to ensure ECU closed-loop control stabilizes, preventing high fuel consumption or emissions. Install with 22mm dedicated socket; observe torque specs.