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Post O2 sensors DO have something to do with DME.. (archive)
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Posted by Jon Caldito on May 16, 2000 at 14:55:54:

In Reply to: The Truth about M Coupe's and Catalytic Converters posted by Michael Cavotta on May 16, 2000 at 11:05:53:

According to my STO55 Engine Electronics Particpants Course Manual which is written by BMW says that "The signal (from the post 02 sensor) also provides feedback of the pre-catalyst sensors effiency and can cause the DME to "trim" the millisecond injection time to correct for slight deviations.

I do like your suggestion of the turbo though!

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