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if you can not locate the coding for the vehicle's OBD-II then you can take the vehicle to somewhere that offers free OBD readings, such as "advanced auto parts" stores.... they can attach the reader, get the codes, look them up, and tell you what's wrong... right there, for free.

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Q: What could be wrong with a 1997 Ford F-150 if the OBD-II codes PO 170 and PO 174 are showing up?
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