- Enhance your vehicle's performance and efficiency with our Oxygen Sensor, designed to minimize downtime and reduce maintenance costs. - Compatible with Ford Focus and Ford Transit models, this Lambda Sensor features 4 wires and is an ideal replacement for part numbers 1035595, 1053108, and 3721930. - Installation is straightforward: 1. Place the new sensor in the exhaust system. 2. Disconnect the existing electrical connection. 3. Use a wrench or socket to remove the old sensor. 4. Apply anti-seize agent to the threads of the new sensor before tightening securely. 5. Reconnect the electrical connection and verify functionality. - The key nut of this oxygen sensor is specifically designed for easy removal and installation of O2 sensors and supports all vacuum switches, ensuring convenience and efficiency in maintenance tasks. - Ideal for regular vehicle maintenance, emissions testing, and performance upgrades, this sensor helps ensure your engine runs smoothly and efficiently, contributing to better fuel economy and reduced emissions. - Made from durable materials, our Oxygen Sensor guarantees reliable performance under various driving conditions, making it a valuable addition to your vehicle maintenance toolkit.