Brilliance BMW 5 Series Oxygen Sensor 11788631049 Precise Air-Fuel Ratio OEM Replacement 0258030299/0300

Huachen BMW 5 Series oxygen sensor 11788631049; part numbers exactly match original replacements 0258030299/0300; installed on pre-cat or front exhaust pipe; monitors exhaust oxygen to feed ECU and ensure precise fuel injection control. Fits Huachen BMW 5 Series (F10/F18 chassis) and some models with N20/B48 engines. Replacement difficulty medium; use a specialized socket; about 0.5–1 hour; avoid damaging threads. If the check engine light, rough idle, or weak acceleration occurs, first inspect this sensor.