MES for PC (don't know about iOS version) does not archive errors that have been cleared. However MES creates a long file for each session and there all the errors etc. are saved.

All interfaces unless they a multiplexed and supported by MES (MES supports CANtieCAR and Vgate vLinker multiplex interfaces) will require the use of adapter cables as required. If and adapter cable is required then MES should prompt accordingly. If your 2018 Guilia has a Security Gateway (SGW) then...

When you first connect MES does a list of modules/nodes it finds. Is the SGW listed there?

Check here: https://www.fiatforum.com/directory/categories/multiecuscan-register.4/

It might work. I've not personally checked but I believe the SGW sits directly between the EOBD socket and the Body Computer Module. From the BCM the CAN Bus then fans out to all the relevant units. I also suspect that the BCM may do some buffering/isolation and termination balancing. You may find t...

Try doing an Oil Change Reset in the Engine ECU. NOTE! This is different to a Service Reset.

Also because the oil reset has not been done the vehicle DPF filter is probably clogged and a Force Regen is required and probably several times as well.

OK. I understand. I was trying to say that if you don't want to replace the whole light cluster which would be expensive you could look and just replacing the halogen DRLs (Daylight Running Lights) bulbs with LEDs ones and leave the Headlamps/Driving Lamps as halogen ones. If replacing the whole uni...

If it is just the DRL bulbs then have you tried just replacing them? No need to change the whole lamp unit. MES / other will also not be required. And don't be confused by so called CAN Bulbs/LEDs. There are no such beasts. What they are really saying is that the LED replacement should not cause a l...

MES on does not support DASHBOARD module on the Alfa 156 cars. It is normally the DASHBOARD/Instrument Panel where one can write the odometer.

If engine temperature is not a listed parameter on the dashboard connection (I see it is for the Siamens dashboard versions) then you will have to use the engine temperature on the engine ECU parameters.