Shop Ford Fusion O2 Sensors. Find Ford Fusion O2 Sensor Socket & Spacer. Learn Ford Fusion Oxygen Sensor Replacement Cost. Use Ford Fusion Sensor Cleaner. Maintaining the oxygen sensors in your Ford Fusion is pivotal for optimal engine performance and fuel efficiency. To prolong their lifespan, avoid using leaded fuels and ensure your vehicle is regularly serviced, which helps prevent soot build-up on the sensors. Signs that an O2 sensor may need replacing include a rough engine idle, decreased fuel economy, and a check engine light. When shopping for a new sensor, select from high-quality options like wideband or titania sensors, which offer faster response times and greater precision. Always opt for a direct-fit sensor to simplify installation, assuring a seamless integration with your Fusion?s onboard computer system.