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Old September 10th, 2013, 08:33 PM   #1
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Default 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.
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