Hyundai Elantra/Accent Oxygen Sensor 39210-22620 Precise Air-Fuel Ratio Monitoring Upgrade

Hyundai Elantra and Cn07 (Pony) models may use OEM 39210-22620 oxygen sensor; high compatibility and precise air-fuel ratio monitoring. It sends data to ECU to optimize fuel injection and burn efficiency. After installation, can resolve high fuel consumption, weak acceleration, or excessive exhaust emissions, particularly improving idle stability and engine vibration. If fuel economy suddenly worsens or exhaust shows black smoke or the check engine light comes on, the oxygen sensor is likely aging and needs replacement.