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Q: P1406 where is the differential pressure sensor? Or the downstream line. on 2002 Ford Taurus

P1406 is the code that is present .....I need location of differential downstream line or the location of the differential pressure sensor...
Thank you!!!!
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It is on the side as the fire wall behind the upper intake. Its a small 3 inch long by 2 inch tall plastic box with two hoses coming off it
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