W205 Diesel EML only/always when Fuel

[Mark1974]

Hi All

I have a 2015 W205 1.6 manual Diesel Bluetec. When the fuel level goes low...not on 1st (amber) warning... but on the 2nd warning, when Fuel Pump symbol goes red, it no longer tells you the remaining mileage and white bar flashing ...the EML comes on, if you drive for even only 1 or so miles. It never comes on at any other point. The car is not or never is sluggish, nor in limp mode...it's simply the EML turns on.

I have a cheap scanner to turn it off ...the code (from memory p2463) relates to dpf and soot accumulation but there is nothing wrong with it, again never sluggish nor in limp mode...this only ever occurs on the 2nd low fuel warning (never the 1st amber warning) . Faulty dpf / box / or exhaust temp sensor ? I think there's 2 of these on exhaust , one before one after dpf...not sure if they're called dpf or nox or temp sensor..

I mentioned it at last service Mercedes found nothing it was also in for a nox software update at the time...again nothing noted by Mercedes.

It's just annoying, it's not causing any performance issues.

 

[robin.large]

Does this happen every time the fuel level goes this low or only sometimes?
At a guess it may be that the EML is triggered by a need to (soon) complete a DPF regen cycle but recognising there is insufficient fuel to complete the next DPF regen cycle?
Just a guess on my side.

Sent from my ONEPLUS A5010 using Tapatalk

 

[Mark1974]

Hi Robin thanks for revert...its everytime the fuel goes to this 2nd warning level (again never the 1st low level warning) ...eg only on the red fuel pump symbol ... I read about about expected regen and how they won't occur with less than 20l in tank but then I would expect the EML on at below 20L or 1st Amber Low Fuel level ... Not always this 2nd level.

Also if a regen every 800-1000 km ...am I that unlucky it would occur at the same time as Tank on this 2nd Warning level...

As I say it's more annoying than anything no performance issues at all

 

[Mark1974]

I suppose I shouldn't drive it at this low 2nd level in any instance but doesn't always happen that way