When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
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?
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
Last edited by dbcl; 02-05-2023 at 09:20 AM.
Reason: model
02-05-2023, 08:41 AM
OBD2 monitoring disabled?
