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I pulled DTCs PO478 and PO 470. Exhaust back pressure codes. Is there an easy fi on 2002 Ford F-250 Super Duty

DTC PO 478 and 470 back pressure codes. Is there an easy fix? Have a smog ck tomorrow

Asked by for the 2002 Ford F-250 Super Duty
could be egr valve or dpfe valve if applicable
Oh, It's a 7.3 diesel
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1 more answer , 1 more comment
possible EGR passages are clogged.
I didn't mention it's a 7.3 Diesel