Land Rover Freelander Oxygen Sensor 7G91-9D375-AA 0258017119 Direct Replacement Installation

Land Rover Discovery Series oxygen sensor, OEM number 7G91-9D375-AA, corresponding to Bosch part 0258017119; installed before and after the catalytic converter. Monitors exhaust oxygen content in real time and feeds to the engine control unit to adjust air-fuel ratio for emissions reduction and combustion efficiency. Original position installation requires no additional modification. If the vehicle experiences higher fuel consumption, weak acceleration, engine fault light, or nosey exhaust odor, sensor aging is likely; replace promptly; installation time about 1 hour.