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I think all differences in ME ECUs are external and they are interchangeable. EPC gives same p/n for left and right ME ECUs. I know for a fact the old LH ECUs are the same for my 600SEL.
Looking at you csv file, it may have an answer for your problem. What if one sensor was declared bad and no longer used for fuel control. I don't know, but maybe this ECU has a capability to control using O2 sensor from the other bank? Look at the xls file attached. I re-formated your data and made a chart. I does look like fuel trim for bank 2 follows bank 1. We don't have enough samples to be sure.
At this point I would reset adaptations and all faults in the ECU memory (if possible) and see what happened as ECUs re-adapt. Swapping ECUs may be a good step too.
Mike
Last edited by myarmar; 11-12-2007 at 09:21 PM.
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