Hyundai Tucson Rear Left Oxygen Sensor 39210-37543 Precisely fits original factory position

Hyundai Tucson rear-left oxygen sensor 39210-37543 installed behind the catalytic converter monitors exhaust oxygen content and feeds ECU to precisely adjust the air-fuel ratio for accurate emissions. This sensor is a precise OEM-fit location and suitable for specific Tucson year ranges; replacement difficulty medium; labor about 0.5-1 hour; when removing, avoid thread damage. If fuel consumption rises, engine warning light illuminates, or idle becomes unstable, replace.