Engine Management Light on after Service (Bradford Dealership)

Wighty

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[QUOTE="Its easier to sell the car in future when you have FMBSH.[/QUOTE]

Er No it isn’t buddy :D
 
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rafter_01

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That’s when it usually is done, I would ask the question?

I can the question. Lets see what they say.

The EML has been reset now so no light. What do you suggest i do, a) tell them what the recovery guy told me or b) don't tell and let them work it out and see what they come back with?
 
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rafter_01

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[QUOTE="Its easier to sell the car in future when you have FMBSH.

Er No it isn’t buddy :D[/QUOTE]

Sorry my first owned car after a run of lease cars.

I was under the impression that a FMBSH is a good selling point. I would look for that when purchasing a new car.
 

Wighty

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Er No it isn’t buddy :D

Sorry my first owned car after a run of lease cars.

I was under the impression that a FMBSH is a good selling point. I would look for that when purchasing a new car.[/QUOTE]
Most of us would probably on cars over 3 years old prefer MB independent specialist service history , that’s a generalisation I know .
In the end though cars don’t cost more with FMBSH but as you say they could be slightly more saleable
 

malcolm E53 AMG

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I can the question. Lets see what they say.

The EML has been reset now so no light. What do you suggest i do, a) tell them what the recovery guy told me or b) don't tell and let them work it out and see what they come back with?

Just make an enquiry at the moment to ascertain whether the engine NOx software update was done at this service, if it was and the EML does come back on you will be better equipped to argue that the update had something to do with the NOx sensor problem. We have had this situation arise on the forum a few times do a search for NOx sensor failures
 
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rafter_01

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Just make an enquiry at the moment to ascertain whether the engine NOx software update was done at this service, if it was and the EML does come back on you will be better equipped to argue that the update had something to do with the NOx sensor problem. We have had this situation arise on the forum a few times do a search for NOx sensor failures

Okay thanks
 

Steve@Avantgarde

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Unless your car is under warranty, no software update is carried out routinely.

Full MBSH does not make your car any more valuable than having your car serviced at an independent. CAP values are based on vehicle model, mileage, owners and whether it has a full service history, there is no extra value given because its serviced at a main dealer of any particular manufacturer.
 
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rafter_01

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So far my EML hasn't come on since the Mobilio came out and reset it.

But tomorrow i have my car booked in with Mercedes, do i delay the appointment and give it a few more days and see if the EML will come back on then take it in or just go ahead with the booking tomorrow and let Mercedes assess it too?

I am worried that taking it Mercedes might trigger the EML off again or something.
 

Steve@Avantgarde

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If there is no EML light/code because Mobilio reset it, then MB won't be able to do anything.

Blimey, I know we nick name them stealers but the paranoia is something else!! They can't and won't do anything deliberately to your vehicle, if they did they would be liable for fraud and criminal damage! Please don't take this the wrong way but do try and keep a level perspective. Coincidences do happen.

Think of it logically, changing the oil and filter in your engine is not going to effect anything in your electrical system.
 
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rafter_01

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took the car for a long drive today and the EML hasn't come back on yet (fingers crossed). I have postponed the booking at Mercedes for a few weeks so i can give it a little more time.
 

Botus

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Software updates are routinely carried out with servicing at Mercedes dealerships. Some forum members have avoided the dealers for this very reason. Oh and cost of course.


I think that's very misleading (I suggest this is more accurate)

Software updates should be routinely carried out with servicing at Mercedes dealerships, but they don't bother
 

EmilysDad

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......
Software updates should be routinely carried out with servicing at Mercedes dealerships, but they don't bother

Apparently you have to specifically ask for sat-nav updates even when the car is new and they'd have been free.
 

Botus

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they should check for safety critical updates and apply ONLY these if they are a responsible dealership / have no work on....

9 out of 10 don't meet that criteria...
 

ajlsl600

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Mercedes nox sensors, and some others are Rubbish in the quality/longivity department many seems to just about get out of warranty. As posted some manage to get Benz to replace foc but it's a lottery on an item that in some cases is not fit for purpose, and an update is another potential minefield.
 

bladecrazy

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i,m having the same issue, been told that i have to change 2 because the part has been updated, just been told because my car was serviced by an independent the last 2 times they will not help towards the cost of replacement even though it has full service history and only 70k on the clock, its the last merc i will own period.
 

star

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We used to get these done under goodwill, very hit and miss, some taxis with 180k passed and yet another @ sub 100k fail
 

bladecrazy

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It is hit and miss, feel like i,m being penalised for useing an independent but its always updated with star so i cant see the difference and always get a service printout.
 

Botus

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right, so an update.
Mobilio have come out and said its the nox sensor that is showing up as faulty and not related to the service.

The bloke who attended said the first step is to clear the error and reset the nox sensor.

He said if it was to appear again then i'd have to replace the Nox sensor and its usually around £400 (WTF).

I don't understand, i take my car for a service then bring it home. Start it an hour later and the EML is on which has never been on in the 3 years owning this car. Really annoyed to be honest.

He said i can raise with the Bradford dealership but i might not be able to do anything as it's not related.

How do i approach this? Am i screwed ?


I posted about an issue which may well be this "fault"...

certain modles have a time related fake warming light built in to the original software to make you go to a main dealer.... as its a software switch you can't replace any components and get the light out even with dealer kit

they have been found out, but there is no TIPS document listing the software update that turns the light off, and to pretend it wasn't a blatant out and out criminal act at time of manufacture they have made the software update only applicable with a new sensor



There’s a brilliant free mag that you can pick up in some parts factors... it’s called “professional motor mechanic”. Mostly has articles on new parts suppliers, updates and improvements to existing stuff and info on new ranges of spares coming to the market re complex systems that are becoming more and more popular.

The other bit it does is have a deep dive into to the odd nasty surprise tripping up many garages. Often covers weird electrical faults. I remember one about Seat with a misfire and it was a failing ECU the diagnostics couldn’t pick up.

Anyway back to Mercedes.... Now thinking as I write this.... it sounds very much like the article is trying to highlight Mercedes now deliberately build in fake faults that will get you an MOT failure. Yet outside the dealer network it will never get fixed and is only there to discredit independent garages and push an owner back in to the main dealership network. Funny that, as writing this I remember a guy at work having the VERY same issue impact a Vauxhall Mokka’s and CAT sensor faults no one can resolve....

The mag doesn’t quite say its deliberate fake faults being engineered into cars. But the fix is a great example of how your ave indy is never going to know about or be able to resolve. You get a real fault code on diagnostics, you can measure a real fault with the offending sensor and you can buy a genuine new sensor and correctly replace it. But still have the same issue ongoing.

On the E class 2015 EML light comes on but the car drives OK, however diagnostic show P22AA heater circuit failure on the CAT sensor . The article goes on to say Merc have never even released a TIPS document re the issue and the part man will ALWAYS sell you the wrong spare part.

The first part of the fix is to retrofit "special equipment code 30o" via online dealer tools. This updates the vehicle record so the parts EPC will now sell you the correct “updated spares”, you then replace both CAT sensors, reset adaptions on the SCR, then need to flash the Engine, Gearbox and Selective Catalytic Reduction (SCR) modules and clear stored codes.

Funny as I write more points come to the fore about conspiracies... Recently we've had a sudden recall to flash many Merc ECU because "the EML light might come on". I suspect the EU got wind of the fun above.... and instead of buying two CAT sensors and giving Mercedes 500 quid... they've been told to take the trick out of the system "NOW !"


Its along the line of "the outside temp sensor might play up and give funny readings..." AKA the emissions fiddle. Certain manufacturers didn't use the far more sensible no movement at the steering wheel sensor to fiddle the map, they used the out side temp sensor.

When the car notices a totally static outside temp reading of x degrees C, you are in the testing lab, "run cheat map". Of course that "never" happened. Or should I say we need to remove it because the current chief exec doesn't like prison food. But how do we get customers in the workshop to remove it....

Which of course brings me to how the other main German manu probably does it but no one has found it.... why not use the suspension level sensors ? You could get much more clever with some suspension algorithms in case there's bumps in the testing lab... you can even build it into the stability control so there's a legitimate link to the engine management software !!! So VW got caught cos the fix was simple, this one got caught cos its too black and white and the other manu was a bit more clever
 
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