YESON EFI Oxygen Sensor 27N-02 Dual Wire China IV Universal

YESON 27N-02 oxygen sensor replaces original part 27N02; universal two-wire design for China IV standard; directly replaces older unit. Core function is monitoring exhaust oxygen and feeding the fuel injection system to adjust air-fuel ratio, ensuring engine combustion efficiency. Compatible with gasoline engines meeting China IV emission standards, particularly those matched to Yesin injection systems. After installation, can fix high fuel consumption, weak acceleration, and excessive exhaust emissions, restoring stable operation. If idle is unstable, fuel consumption rises significantly, or the engine warning light is on, the oxygen sensor is aging and should be replaced.