OBD II Trouble Codes 0171 and 0174 | Page 2 | Ford Explorer Forums - Serious Explorations

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OBD II Trouble Codes 0171 and 0174

I have a 97 Ranger that had the same codes. The truck sputtered and stalled on me and got worse over time. I had o2 sensor replaced, EVAP work, MAF work, etc. Nobody was able to figure it out until...

It turned out to be the lower intake gasket. Works GREAT now.
 






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