Bosch 17321 Oxygen Sensor, Original Equipment (Ford, Lincoln) Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions "True Direct-fit" OE connectors and harness Double laser-welded stainless steel body protects against contamination Pre-coated threads with anti-seize compound right out of the box Bosch invented the oxygen sensor and manufactures more oxygen sensors for the independent aftermarket than any other supplier.