P0403 code EGR circuit malfunction

Kurth

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Wisconsin
P0403 code replaced egr and reset computer keeps coming back, somebody spliced a new 5 wire connector in the past i didn't notice it til last night the car was bought used 8 years ago. Has anyone ever come across this problem if so i would love some info we need to get the car emissioned before the 25th of june.
 
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