Yamaha YS125 Motorcycle Oxygen Sensor 2BM-H592A-00

Yamaha YS125 motorcycle dedicated oxygen sensor, OEM number 2BM-H592A-00, installed on the front section of the exhaust pipe, monitors exhaust oxygen content in real time and feeds signal to ECU to adjust air-fuel ratio for combustion efficiency and emission compliance. Installation difficulty moderate; estimated 30 minutes; avoid damaging threads during removal. If idle unstable, weak acceleration, obvious fuel consumption increase, or MIL illumination occur, sensor aging or deposit buildup likely; replace promptly.