Engine - 4.6L & 5.4L
Appreciating this community, a rich resource for Mustang owners!
98 Mustang 4.6L SOHC. Car is new to me, and scanning both upstream (pre-cat) O2 sensors the passenger bank is very slow to respond. It will move, but not nearly as much as the driver's bank. Swapped O2s same thing.
I had a...