2000 mercury cougar

2000 MERCURY COUGAR
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SONY
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i put it on a dia. test and the code P0171 flashed. What does that code stand for?
May 5, 2007 at 5:19 PM
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MERLIN2021
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P0171 Fuel Trim System Lean Bank 1
Change 02 on bank 1 if over 50,000mi
May 6, 2007 at 8:21 AM