Harley-Davidson Sportster/883/Dyna Oxygen Sensor 2-Pack Front and Rear 32700005/32700006

This replacement uses stainless steel housing and ceramic sensing elements, matching OEM build; durability verified on bench tests for high-temperature exhaust environments. OEM corresponds to 27727-10; fits Harley-Davidson Sportster 1200, 883, Dyna Fat Bob etc. Function: monitors upstream and downstream oxygen concentrations, feeds ECU to adjust air-fuel ratio, ensuring catalytic converter operation and reducing emissions. Installation difficulty: medium; requires removal of exhaust manifold and oxygen sensor sleeve; perform with the engine cold to avoid thread damage.