Start stop not working on b class

[punnorg]

MB's ECO Stop/Start op criteria is generally complex one, and differs across model types. Compute variables include vehicle's average engine idling times at set intervals from (journey) start, engine and trans oil temps, outside (bay/exhaust) air temps, slope gradient (for heavy models like S), cambelt runtime, alt charge rate, aux/main batt amps, ECU calc data for ECO score (ACC rating), certain time/milometer thresholds on diesels, (+ clutch throw-out speed states, injector burn rates, and front wheel tyre pressure for mostly heavy products afters 2018), to name the main ones.

I was a senior ME for Daimler but now at both Aston and Airbus (don't ask!). Main rule inside MB, BMW, VAG, PSA, etc. is that if you don't sufficiently implement coasting in your drive-style, then ECO S/S is pointless for you and will exit your vehicle's operational profile by manufacturer's design. My own advice is - don't coast and give ECO S/S a pass. Hope you understand. Thanks.

 

[wongl]

It was a good point being advised to go to a independent, and I will if all other avenues are exhausted, but there is a bigger real cost in going to say Southampton that has been recommended it’s half a day off of work and a 3 hour drive.....

If you are confident that your Aux and Main batteries are in good working order and charged up, then it is possible that your battery sensor (on the negative terminal of the main battery) is faulty. This is not a common fault, but the failure of this sensor has been reported in this and other MB forums from time to time.

 

[David404]

I use an indipendent MB specialist for all my service/repair work. On occasions I've had faults I've taken it in, they connect to Star machine tell me what fault is Andi book it in for repair, I don't pick up specific charge for diagnosis. It'd no doubt built into repair cost somewhere but they are way cheaper than main dealer. But you have to build a relationship with the workshop they have to know they will get the repair work.

 

[RanaMB]

I use an indipendent MB specialist for all my service/repair work. On occasions I've had faults I've taken it in, they connect to Star machine tell me what fault is Andi book it in for repair, I don't pick up specific charge for diagnosis. It'd no doubt built into repair cost somewhere but they are way cheaper than main dealer. But you have to build a relationship with the workshop they have to know they will get the repair work.

Well said.