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[TheBoy]

yes, i'm still on about that EGR valve!...

you know when either i've cleaned it or replaced it - assuming it's now working, should the EML go off, or does the system need to be reset?

(i thought i'd read somewhere that the battery needs to be disconnected to reset the system - yes? no?)

oh and one more thing, a friend's told me it should run marginally better if i blanked it completely.  true?  (if it were blanked, would the EML remain on?)

ta,
lachleaves :-/

The EML will go out once problem fixed (next start).  It may disappear from flash codes after 20 clean starts (some codes do, some don't).

There will be no noticable difference between a blanked off egr and a non blanked off one.  As long as egr works electrically, the ECU is happy.