I have a 1996 Mercury Cougar with the 4.6l engine. The car has 4 o2 sensors; 2 upstream and 2 downstream. Are they all the same sensor or are they 2 different kinds? The ones in front appear to be longer than the ones on the back. I bought all 4 but they are all the same. Is this correct?
Feb 19, 2009 at 6:31 PM
