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EGR blanking and MOTs


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EGR is currently "blanked" (well - the screw in the vaccuum hose method)  - Should I 'unblank' it before an MOT? (Either for reasons of meeting the emissions criteria, or any other rules about messing with emissions devices (although I think that only applies to DPFs?).   It's an SDI, do they still just check smoke values on diesel MOTs?

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Yup, you'll be good. You will actually get a better (lower smoke) number with EGR deactivated. Only thing that goes up is NOX which is only measurable during loaded driving (think vdub diesel scandal). Limit is 2.5 units, but see if you can below 0.5 (which is really clean). 

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