Mercedes Electrical Faults. Stop Car Leave Engine Running Message 

I've found that often just a single time flattening the battery is usually the beginning of the end.

Training is poor these days, very basic. They are more like fitters than mechanics.

Obviously not a good garage. I know of a few garages in Luton that have literally a wooden shelter with blue tarpaulin as the roof. Work standards are terrible. Coming from me a person who works roadside 😄

A mechanic is only as good as his tools.

I don't think how good or bad the tools are make them a good mechanic. Yes having the most modern, up to date kit makes diagnosis a lot easier but 99% of diagnostics come from knowledge, experience, common sense and being methodical. A poor mechanic with the best tools is still a poor mechanic. Too many garages are parts fitters replacing parts to see if they are faulty until they hit the bullseye. These are the bad mechanics who don't know how to diagnose properly and sadly the customer takes the hit. I'm amazed at how many cannot even read wiring diagrams or even have an oscilloscope to hand. Rant over, loving the videos BTW.

It's not that most mechanics are useless, it's that anyone can claim to be a mechanic.

Some Mechanics don’t understand that a battery can need replaced even though it starts the car. That fact confuses Mechanics that have not kept up to date with technology. My Jag XJL (X351) was the 1st car I owned (back in 2013) that would have all kinds of electric issues when the battery got discharged fully after an alternator pulley failure. The Jaguar Main Dealer wouldn’t replace the battery and I had all kinds of weird faults afterwards. I tried an overnight trickle charge and it improved a little but a couple of weeks later the battery died completely. I was lucky I had already bought a battery to replace it And this wasn’t a car with Stop/Start and only had one battery. I don’t think it was an AGM battery though, the later Stop/Start models had two batteries.

Thank you very much 😊

Of course you have to! I bet this one will come back in a year with exactly the same problem.

This vehicle has no option to reset BMS. only to change the battery size AH

at Ford, the reset is done with fog light buttons and an emergency alarm, but still not enough.

@@sbiablewhat would you know guitar boy

@@StelioKontos-wk9km even if it comes back in a year, he has a receipt for the battery with 4 years warranty 😁

Better than putting it inside the car IMHO

Most late model Mercedes are in that location, the thing to watch is refitting that cabin filter as often the plastic breaks when refitting the clips.

there is a gas outlet tube provided

Not for this particular car. No option to do so. Only to change battery size

Of course but I'm just testing to confirm and show the viewers

Indeed but nothing else in this area

@ORileysAutos true, but MPD and Motorserv ain't a million miles away too be fair. Obviously Bennetts has the monopoly in Biggleswade!

If I just tested a battery with a multimeter I'd get all sorts of cowboy comments

@@ORileysAutos can’t win bud can ya 🤷‍♂️

No issues if the battery is the same type AGM AH/RC capacity. Major problems if not.

Out of interest. Why does it get instantly ruined, sounds like changing a battery is no longer DIY?

@@herrkiwi3110 well, BMS shall re-learn battery state over the time but JLR , for example, states that you have to initiate battery replacement in BMS. BMW or VAG give you the option to choose the battery manufacturer in some models.

@@garybrown5500 Not instantly but over time it will lose quite a capacity since BMS could not re-learn it properly. All batteries are different, especially from different manufacturers. Especially if you mix Japanese and German ones :) The good thing about Yuasa is that it can be restored to its factory conditions even after 2 or 3 years of use because it is not sealed;)

Battery won't be ruined. There is no option to reset BMS. only if you change the size of the battery AH. I checked on the scan tool.