雪佛兰GMC 下游后氧传感器 12639692 234-4294 原厂替代型

This oxygen sensor directly replaces OEM number 12639692 and is compatible with 2134768, 2344530, 2344242, 12618010, 213-4768; high generic applicability. It monitors exhaust oxygen content and sends signals to the ECU to adjust fuel supply, ensuring combustion efficiency. Fits various Chevrolet and GMC models such as Silverado, Sierra, Tahoe, Suburban, etc. After installation, it resolves high fuel consumption, rough idle, and weak acceleration. If the check engine light comes on or there is a pungent exhaust odor or increased fuel consumption, it’s likely aged and needs replacement.