I have an '02 Mustang V6 Convertible. 163,000 miles. I recently tuned it up with new plugs, wires, fuel filter, air filter, oil and filter change, (1) downstream o2 sensor (it was broken and the check engine light was on). The o2 sensor put the light out and the car was running great for a couple of days. The first problem was that the brights would not work. After sitting for a couple of hours the brights started working but the radio and the wipers quit working. At that point, I checked all of the fuses and inspected all of the relays and found no obvious problems. I then started the car and the wipers and radio worked perfectly, however the car won't come out of park (without tricking it) and the cruise won't work. So, I checked the brake pedal switch. It looks fine and always has been. The cruise is related to the same issue. My thinking is that it could possibly be a bad ground (although I haven't anything yet) or possibly a Body Control Module. What do y'all think?