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you can use a volt meter to get these values sometimes too but it gets tricky and if you read something wrong its easy to get thrown off course.
one way to test the wiring is to unplug the dpfe sensor i think this would send it to 5 volts and throw code p0402 excessive egr flow. i might have it backwards though that might be if you have code p0402 first the you unplug and see if you get a p0401 i will check into this when i get a chance no time right now.
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