Question about 2004 Mazda Tribute

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Code 402 0n 2001 mazda tribute

Was getting a 401 code was told it was egr valve replaced it.still got code so was egr booster replaced it.code changed to 402.this site told me to check air filtewr good advice has been 50,000 miles did that same code 402.have sent emails but no advise.any help thanks

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A code P0402 most likely means one or more things has happened. The DPFE (differential pressure) sensor is faulty and needs to be replaced, there is a blockage in the EGR (most likely carbon buildup) or the EGR valve may not be opening due to a lack of vaccuum.

Posted on Jan 15, 2009


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Posted on Jan 02, 2017


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Is the code 401? Because if it is then it's not your egr its the sensor switch for the egr. It's located back by the firewall it is a black 1 1/2" x 2 1/2" rectangular shaped ,plastic and has a clipped plug on it's long side and it has 2 rubber sleaves coming out of bottom which slide over 2 vacuum lines to the egr and if this sensor has any moisture in it what so ever then you have to replace it. This sensor makes the egr valve open and close. And the tribute are famous for these sensors failing. The Ford part # is 4u7z-9j460-aa. Hope you find your problem.

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