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Re: 98 Taurus check engine code P1131.....HELP
I don't think it is the MAF. If MAF were the culprit, you would have a code for both banks. Remove the suspect O2 and see if there is a lot of carbon built up on it. Usually, in our shop, lack of switching is a lazy sensor and needs replaced. The sensor is the first sensor on the side that has the #1 cylinder on it.(rear next to firewall)
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