CX13670 is an oxygen sensor that interchanges with the Bosch 13670. It is a direct-fit sensor primarily used for Chrysler, Dodge, Jeep, and RAM vehicles from the early 2000s through the late 2010s. An oxygen sensor (O2 sensor) is an electronic device in a vehicle's exhaust system that measures the oxygen content, helping the Engine Control Unit (ECU) adjust the air-fuel mixture for optimal combustion, fuel efficiency, and reduced emissions, with symptoms of failure including poor gas mileage, engine misfires, rough idling, and a rotten egg smell from the exhaust.