SES Code PO400......anyone???
#12
RE: SES Code PO400......anyone???
Ya, the only thing i could figure out was if somehow the diaphram in the egr valve had been puntured some how. I vacuum tested it after I cleaned it and it checked out ok and that is the only thing that I can think of right by the firewall that could hiss.......unless one of the Egr bolts is lose....
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