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  1. K

    reading engine codes for MAP

    Hello! My first post. I have a 99 Explorer, XLT, with 4.0 OHV engine. I only has 78K miles and is in excellent condition. I have recenlty replaced upper and lower suspension and replaced battery 2 years ago. My check engine light has come on twice recently. 1. First code was PO 174- sudden...
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