German imported Mercedes-Benz Oxygen Sensor 0045427318 OEM standard air-fuel ratio control, durable upgrade

German-imported Mercedes oxygen sensor 0045427318 controls air-fuel ratio to OEM standards; strong versatility across M271/M272/M273 engines in C-, E-, S- classes and ML/GL series (2005-2013). Monitors exhaust oxygen content and feeds ECU to adjust injection; improves combustion efficiency. Replacement fixes rough idle, high fuel consumption, weak acceleration, and prevents catalyst damage from over-rich mixtures. If check engine light on or exhaust abnormal, please inspect.