i took my flux capacitor out.....kept on time warping everywhere, all i wanna do is get to work!
serious note: depending on how your xj is optioned you will have the odd mystery plug. mine is a base model, so i have about 20 different mystery plugs
yeah as said above i think i saw a thread asking about that same plug. i dont know what youd type in the search though trying to find it..
may be an ambient temp sensor plug for models with overhead console