Originally Posted by woody
I has been known on other 320 engined MB cars in the past but I don't think it is common. There are actually 4 cats, which ones have 'gone' and how have they determined that? Has it failed an MOT or has the MIL just lit up and thrown a code based on the rear O2 sensors detecting a loss of cat efficiency? I'm curious because mine is of similar vintage. At least it is still under warranty.
Woody, don't count on the CEL / MIL as an indication ... This is one of the many things I forgot to share with you... After removing my cats quite a few months ago and having the "custom" exhaust built, we added a longer bung (+ 5mm) to the aft 02 sensor holes to re-insert the secondary sensors in the approximate same position... I expected the CEL to illuminate from the removal of the cats, but it never did... And still has not...
And it has not thrown any DTC's...