BMW oxygen sensor 11787596924 0258027015 precise air-fuel ratio feedback

BMW models with N-series engines (3 Series, 5 Series, X3) rear oxygen sensor 11787596924 (corresponding to 0258027015), using high-temperature ceramic core and sealed stainless steel housing; bench-tested durability. It monitors exhaust oxygen content and feeds back to ECU to ensure combustion efficiency and reduce emissions. Installation requires disconnecting the negative battery terminal first, then removing the old part with a specialized socket; avoid thread damage.