福特F-150 2.7L 氧传感器四件套 234-5173 提升燃油效率

For 2015-2020 Ford F-150 2.7L EcoBoost, front and rear oxygen sensor four-piece set (two sensors each) monitors exhaust oxygen content and feeds ECU with data to optimize combustion and reduce fuel consumption. OEM numbers 234-5173, 234-5174, 234-8050; directly replaces OEM parts. Replace after 80,000 km or when fault code P0135/P0155 appears. Installation difficulty: medium; uses specialized socket; apply anti-seize on threads to prevent galling at high temperatures. This kit uses standard thread sizes; no adapters required; significantly improves fuel economy and lowers probability of emission fault lights.