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Ford/Mercury specific engine codes display P followed by four digits. If you're looking at a generic code, P0131 means a problem was detected with the oxygen sensor on bank 1 (the side of the engine with the #1 cylinder) where the sensor's voltage remained low for more than 2 minutes. The sensor may need to be replaced, or you may have a short or open in the 02 signal circuit that needs to be repaired.
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Earn +20 ptsQ: What is error code P131 for 2003 Mercury Sable?
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