Ford Model Oxygen Sensor SG1802 250-24301 234-4374 Precise Air-Fuel Ratio Control

Oxygen sensor for Ford Focus, Mondeo, Escape and other models: SG1802 (OEM 250-24301, 234-4374) uses OEM-consistent zirconia ceramic sensing element and heat-resistant alloy housing; bench testing confirms stable operation for 60,000+ kilometers. Monitors exhaust oxygen, feeds ECU to adjust air-fuel ratio for efficiency and emissions compliance. Replacement difficulty medium; use a dedicated socket to remove old sensor; if fuel consumption rises or acceleration weakens, inspect this part.