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Tried posting this on mercedesclub.org.uk but replies were basically buy a new scanner and I am quite attached to my present one.

Just picked up my new second hand CL 500 and have been reading the codes.

Seems there are two ECUs to choose from - $7E8 CAN-ID ECU #1 and $7E9 CAN-ID ECU #2, what is that about?

Anyway ECU 1 has far and away the most info and it says "Distance since diagnostic trouble codes cleared - 160KM" which is 28 miles before I collected it (ECU 2 says 65,535KM since cleared).

That wouldn't worry me unduly as no codes are currently showing and EML light is off HOWEVER further down on ECU 1 info it lists a load of monitoring which is disabled, notably misfire monitoring is off (but it does say later on "misfire monitoring completed") see pic below. Is that normal and should I somehow get them re-enabled?
https://cimg9.ibsrv.net/gimg/mercede...17d3128b94.png

I guess my worry is: Is it possible, with an expensive OBD2 tool that a dealer might possess, to disable misfire monitoring via the tool in order to hide problems from the buyer? Second question - is that what my scanner is showing or perhaps is the ECU clever enough to enable and disable misfire monitoring automatically, when it needs to?

It's a CL 500 (C216) 2009 107K miles