Quote:
Originally Posted by Thorium
Have a look at the manual on your phone app. There are a lot of reasons why the start/stop function won't function as you expect, including outside temperature, heated windscreen being on, passenger compartment temperature, engine temperature.....the list goes on.
If you do a lot of short journeys, the battery may be slightly discharged (another reason why the start/stop deactivates), but it's probably one of the other reasons. I'd put money on it working again once all of the conditions are right.
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As above the battery needs to be something like 98% charged, short journeys or lack of use for a few days soon take it beneath this level a longer run sorts it out unless your battery is losing its efficiency. Our previous Merc the stop start stopped working and the battery was replaced under warranty in only two years.