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      01-28-2013, 05:07 PM   #2
ade146
Private First Class
United Kingdom
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Drives: E90 330d sport auto
Join Date: Sep 2012
Location: S.Wales or Cheshire

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People who have been on the forum have probably seen this question lots. I have done some work on this area. The maf checks actual flow against expected. If the egr doesnt open the maf will be higher. How much error is allowed I am not sure but as soon as you change much egr flow you will get an EML. I have tried all ways and there is no way you wont get an error. Its not position sensitive etc its the maf flow check that fails. There have been members who have fitted these bypass kits to e90s and have not had an EML. Its a mystery to me why not, unless they have a faulty maf, air leak or someone programmed the expected maf flow with weird numbers. There is no kit available to solve this problem. You could fit a filter to the egr or re program the ecu. Let us know how you get on.