BMW Mini R56 E90 E91 Oxygen Sensor 11787560957 0258017113 Exhaust Monitoring

BMW Mini exhaust system oxygen sensor (OEM 0258017113, compatible with 11787560957 and 11787590713) monitors exhaust oxygen content in real time to provide ECU with air-fuel ratio data. If the vehicle experiences rough idle, significantly higher fuel consumption, or weak acceleration, this sensor may be failing. Installation difficulty medium; labor 30–45 minutes; avoid damaging threads during removal. Replacing ensures combustion efficiency and emissions compliance, smoothing engine operation.