08 Mariner (ford escape) left bank lean code
My wife's 08 Mariner, 3.0l v6, 126k miles just threw a left bank lean code after rough idle and hesitation.
I put a bottle of f/i cleaner in the tank and took it for a 20 mile drive. Came home and unhooked the battery to clear the code. Seemed to work fine for a couple hours then started up again.
Since only the left bank is showing a lean condition, could it be a bad injector or o2 sensor?
All equipment is original except for the Alternator which was changed last week.