Just based on my experiences its not necessary.
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egr blanking, anyone done it 2.0 cdti
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Have fitted full blanking plate on every diesel I have had, did over 100,000 miles on my Focus with no issues, egr was in perfect condition, checked emissions with her unblanked and after blanking, there was no difference.
However I have heard blocking can increase frequency of regens,
? not noticed myself though.
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