Is there a trick to disconnecting the electrical connection on an O2 sensor? (2000 tundra)
Usually there is a clip that keeps the two parts together. Most release when the clip is bent away from the connector. If you cannot find it, and are thoroughly frustrated, the old trick is to cut out the connector and splice the wires directly together. Just remember you did this the next time you need to replace it!
Search Toyota Tundra Questions
Toyota Tundra Experts