日产/本田/丰田 氧传感器 89465-20790 空燃比监测 原厂替换

If your vehicle experiences idle instability, sudden fuel economy drop, or check engine light on with exhaust odor, this is typically due to oxygen sensor aging or failure. This sensor monitors exhaust oxygen content and feeds signal to ECU to control air-fuel ratio for efficient combustion and lower emissions. OEM number 89465-20790, compatible with Nissan, Honda, Toyota, and other models; ideal OEM replacement. Install after engine has cooled; clean threads before removing old sensor to prevent debris entering exhaust; use special tool for installation and tighten to specified torque to avoid over-tightening or damage.