My understanding is
The Mod applies to SOME vauxhall engines, Gasket blocks off the ERG, Engine MUST have a software upgrade via tech 2 at the same time.In effect it just stops the EGR function, but also stops fault code being flagged for inactive EGR.
Mod was introduced due to EGR sticking, fault was recurring only few months after new valve fitted. reason given was it is Due to engine starting burning oil.
I have had a few done, cheaper & more effective than a new EGR
Problem is finding exactly which engines are covered, our dealer wont Tell me, ask for £50 to plug in and see ! so don't use them on principle, use local mobile.
Cheers Aidan
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