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      12-05-2012, 03:29 PM   #4
pbonsalb
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Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

iTrader: (3)

The DPFIX seems to be reliable to me. I have not touched it since I put it in about 6 months ago and have probably driven 6k miles since then and have never had a CEL. With the Delete-R, the CEL does not come on, either. I do not know the inner workings of the computer and what is stored that could be detected even though a CEL is not triggered. There is something called a shadow fault that is supposedly in this category, but I do not know much about it.