Just got done replacing sensor that is located above cat. Converter in housing of transmission on driver side. Will need to remove 2 heat sheilds by front of tranny.the lower one first then upper one need 10 mm. Socket and universal joints. The area is tight but doable. Check harness to make sure you have good contacts. Could be loose connection. Hope this helps. My car now kicks into overdrive and is so fun to ride. UCF10.