Suzuki Yamaha Motorcycle Oxygen Sensor 21176-0853/21176-0839 Universal Type

Suzuki Yamaha motorcycle oxygen sensor (OEM 21176-0853/21176-0839) is a universal design, directly replacing original parts; fits most Suzuki and Yamaha motorcycles equipped with a catalytic converter. Core function is real-time monitoring of exhaust oxygen content and sending signals to ECU to precisely adjust air-fuel ratio for optimal combustion. Installation effectively resolves rough idle, sluggish acceleration, high fuel consumption, and excessive emissions. If starting problems, exhaust emits black smoke, or check engine light is on, replace the oxygen sensor.