Hello!

I've got a problem with my 99's L200 K74T 2.5D diagnostic.

I found a diagnostic connector, like an OBD2 connector but I don't know how could I read with it.
My ELM327 doesn't work, and I didn't find this model in MUTIII sofware
Do i need an OBD2 cabel or something else? Which software should i use to read fault codes and datas. Can someone give me a link to the software or the cable which is compatible with my car?

Thanks for the help! (if you can)