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Originally Posted by CMH75
37k miles over 2.5 years on a 2011 35d. At 35k my check engine light came on and it was due to the EGR recall. The dealership fixed it 2 weeks ago and my 35d came out with more power than ever (and slightly lower MPG 21.8 vs. 23.4 prior avg.) 2 days ago, my check engine light came on again and diagnosis is TBD. Nothing feels wrong, still more power than ever.
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Follow up....it's at the dealership now....they will be replacing the "supply module" under warranty. It appears to be electrical, however I'm unsure of its exact purpose. My mpg dropped my 2 mpg avg over the past couple months to 21.5 avg.