Differential pressure switch causing check engine light?

1997 Ford Taurus. I don't remember the exact code but it said something was wrong with the upstream differential pressure sensor. The car doesn't run any differently. How do I fix it?

Very common problem on Fords. It can be a bad sensor or a leak in the tubing. Read this post. It explains the whole system and how to check it out.

http://ricksfreeautorepairadvice.com/ford-dpfe-sensor-and-egr-system/

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