Final update - the ECU fixed the car. I just smogged it last week and it posted the best numbers since 2002, with original cat still in place.

One thing I noticed while trolling the yards was the plethora of ECUs to choose from. It is an item that is worth replacing if you've tried everything else.

Gregg

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Gregg

'92 500E (Sold)
'07 E63 AMG (Sold)
'10 S550