Ford Rear Oxygen Sensor 3M51-9G444-CA/CB 0258006571 Replacement Upgrade

If your vehicle shows engine warning lamp on, abnormal fuel consumption, weak acceleration, or acrid exhaust odor, rear oxygen sensor aging is likely; it cannot accurately monitor exhaust oxygen after the catalytic converter. This sensor, when functioning, feeds exhaust oxygen concentration to ECU to adjust air-fuel ratio for emissions compliance and smooth power. OEM number OZA659-EE75 (compatible with 3M51-9G444-CA/CB, 0258006571); fits Ford Focus, Mondeo, Kuga, etc. Installation requires using a dedicated socket to avoid damaging the ceramic probe; ensure connector is securely plugged; after installation, clear fault codes and road test.