Nox Sensor, advice required!

[rafter_01]

Hi all,

Some background info, I got my car serviced in June (64 plate c class) by the local stealers and upon leaving the dealership and to getting home, my EML came on.

I called out the recovery service and it was discovered that the fault was related to the nox sensors. The engineer who came out reset the EML light and advised that if it happens again the nox sensors will need replacing.

Informed the stealers of what happened and they advised me that I should get back in touch if the EML triggers again.

The same thing happened again yesterday, EML lights on, recovery service has come out and its the same issue.

Called up the stealers and are willing to book the car in but informed me that there's a possibility of a diagnostics charge plus whatever the cost will be for the nox sensors. What?!!!!!

Well annoyed and after a few back and forths, the lady on the blower advised that Merc are offering a free software update and this might resolve the issue. She said the nox sensors might not be faulty.

What do I do? I'm confused and annoyed knowing that my car never had this issue before the service and not sure what the software update will do.

Anyone experience this?

Thanks

 

[TheBlimp75]

Hi,

Yes have experienced , luckily in a 2016 E Class which was still under warranty, had EML come on as was driving away from showroom and 1 NOX was replaced and then both replaced again 6 months later after EML light came on.

My understanding is that the sensors were of a poor quality and kept getting fried with high temperature. So new ones were designed and of course charged to customers as the EML light came on.

If you argue with MB I have heard of them being replaced as goodwill.

Also had the software update on which doesn’t seem to have affected the car .

Hope this helps.

Ian


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[robin.large]

Ask if they have applied a software update? Most likely they have and this requires a slightly 'imprived' Nox sensor otherwise EML.

Should be their cost - they will argue.

If they have updated and argue the point go as high as you can get with MB customer complaints/service.

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[rafter_01]

Ask if they have applied a software update? Most likely they have and this requires a slightly 'imprived' Nox sensor otherwise EML.

Should be their cost - they will argue.

If they have updated and argue the point go as high as you can get with MB customer complaints/service.

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Not applied this software update before. Not sure how high I can go up, got a feeling they will fob me off.

 

[rafter_01]

Hi,

Yes have experienced , luckily in a 2016 E Class which was still under warranty, had EML come on as was driving away from showroom and 1 NOX was replaced and then both replaced again 6 months later after EML light came on.

My understanding is that the sensors were of a poor quality and kept getting fried with high temperature. So new ones were designed and of course charged to customers as the EML light came on.

If you argue with MB I have heard of them being replaced as goodwill.

Also had the software update on which doesn’t seem to have affected the car .

Hope this helps.

Ian


Sent from my iPhone using Tapatalk

Hope they do replace them, heard they are super expensive

 

[robin.large]

Not applied this software update before. Not sure how high I can go up, got a feeling they will fob me off.

Need to ask them about that software update. It's not always clear when dealers do that.

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[rafter_01]

I have AA parts and garage cover (before this issue occurred), could I use this service to help with the costs if I had to pay?

 

[TheBlimp75]

Hope they do replace them, heard they are super expensive

Unfortunately they are , £600 ish per sensor through MB you’ll need 2.

They know there have been issues with them so I would definitely push for goodwill.


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[rafter_01]

Unfortunately they are , £600 ish per sensor through MB you’ll need 2.

They know there have been issues with them so I would definitely push for goodwill.


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Crazy price.

 

[ajlsl600]

Its just a benz cash cow.that they hope u will pay for. Its kit nffp and dont work with software upgrade in my view a recall issue but benz uk will fight that to last. If u have fmbsh u might get it foc but for me its either dodgy kit or not if is mbsh is not the point its unfit for purpose simples. ,I will be finding a way around this or getting rid of motor ,hopefully before drama shows up. I checked my vin and update appears not needed on mine ,but I think I am just waiting .......

 

[rafter_01]

Its just a benz cash cow.that they hope u will pay for. Its kit nffp and dont work with software upgrade in my view a recall issue but benz uk will fight that to last. If u have fmbsh u might get it foc but for me its either dodgy kit or not if is mbsh is not the point its unfit for purpose simples. ,I will be finding a way around this or getting rid of motor ,hopefully before drama shows up. I checked my vin and update appears not needed on mine ,but I think I am just waiting .......

She checked my vin and said I was due an update

 

[ajlsl600]

See service manager and get update req in writting saying WHY .and accepting if u get nox issues as a result the issue is for them to resolve.
U might get lucky ,recently on here there was a case of a dealer standing up and replacing the sensors foc,seems a lottery.

 

[Welshguy]

Hi all, I’m not mechanically minded, so apologies.

I’ve had my C250 estate two years and recently took it in for a A service, which I was informed was £900! I queried the cost and they provided the breakdown which made sense.
When I took it in they informed me that there was a recall issue and that a software update was required. They also told me that the ad blue needed a top up too.
By know I was highly unimpressed on top of the fact that I could not use any facilities and had to walk around Swansea like a nomad for 5 hrs.
When I returned to collect the car they told me that further work is required as it would fail an mot so I need to take it back. Further costs are estimated to be between 200 - 350!!
I have driven it for about 200 miles since the service and it is not the same car, the mpg is way less and it’s revving when trying to go through the gears is awful. I’m so bitterly dissatisfied and feel ripped off.
On top of that, I had it valued a week prior to the service (at a different garage), and the MB garage that gave me the service valued it 800 less, WITH the newly undertaken service.
I honestly wish I’d taken it to my local MB specialist mechanic instead.

 

[Botus]

…. the trouble is only a few have the dealer on-line kit enabling them to flash updates at the cars. and then even fewer have the kit spare to do long winded updating on multiple modules. Most need the kit to fault find on the other cars they have in. So unless big enough to have more than one bit of kit they struggle.

unfortunately at your vehicle's age they have often been out of the dealer servicing / update process for too long that merc feel able to hoodwink owners in to getting you to pay for stuff that should have happened at the end of its 3 year warranty

without full merc or very reputable indy service info it all unravels...

Few owners help themselves, I know a very clever guy that used to work for a car manu site up north, recently bought a merc still under warranty and after my insistence, refused to go get his free maps, any other updates and his dieselgate stuff sorted.... and now the sensors play up at 3.5 years

Instead of paying £300 for an oil change to sweeten the deal as they load any comand software updates and his "free maps" and then get his dieselgate done correctly... he's waited till it limps and throws a light then pays out £600 to bodge on mk2 NOx sensors and will struggle with the car for 3 years till he throws it away !!!

the only suggestion I have is after reading my other post find a bit more evidence re your specific engine then write to merc and the ombudsman and see if they throw 300 quid back at you

 

[ajlsl600]

With modern cars ,esp benz ,I know little of others.its a research ,,learn ,,save .or a pay, pay ,pay scheme the days of buy a car , run , repair,run are now near history so thats it in my view. Get an old classic fix yrself,no mot no tax, and keep going till state slam that door or u are no longer vertical. U will loose some mpg but no tax no mot and dirt cheap insurance will still have u in front ,for time being !
I understand this is not for really busy high mile guys but for us retired or near its a reasonable option

 

[bladecrazy]

so... it seems mercedes are updating cars knowing that if the old sensors are still fitted then the eml will come on and you would then have to go back and have the 2 sensors replaced? seems that way.

 

[robin.large]

Depending on how 'pushy' people want to get about replacement parts even Nox sensors the invoking consumer rights can work.
Goods have to be fit for purpose...... It is arguable that if a part is not subject to service, adjustment, repair or replacement in the normal schedule of works then it is or should be 'life of engine/vehicle'
Or arguably at least the length of any age warranty.
Worth having a go at 'goodwill' with head office customer care team on that basis.

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[rafter_01]

Depending on how 'pushy' people want to get about replacement parts even Nox sensors the invoking consumer rights can work.
Goods have to be fit for purpose...... It is arguable that if a part is not subject to service, adjustment, repair or replacement in the normal schedule of works then it is or should be 'life of engine/vehicle'
Or arguably at least the length of any age warranty.
Worth having a go at 'goodwill' with head office customer care team on that basis.

Sent from my ONEPLUS A5010 using Tapatalk

Do you have the contact details for the Head Office?

 

[ajlsl600]

…. the trouble is only a few have the dealer on-line kit enabling them to flash updates at the cars. and then even fewer have the kit spare to do long winded updating on multiple modules. Most need the kit to fault find on the other cars they have in. So unless big enough to have more than one bit of kit they struggle.

unfortunately at your vehicle's age they have often been out of the dealer servicing / update process for too long that merc feel able to hoodwink owners in to getting you to pay for stuff that should have happened at the end of its 3 year warranty

without full merc or very reputable indy service info it all unravels...

Few owners help themselves, I know a very clever guy that used to work for a car manu site up north, recently bought a merc still under warranty and after my insistence, refused to go get his free maps, any other updates and his dieselgate stuff sorted.... and now the sensors play up at 3.5 years

Instead of paying £300 for an oil change to sweeten the deal as they load any comand software updates and his "free maps" and then get his dieselgate done correctly... he's waited till it limps and throws a light then pays out £600 to bodge on mk2 NOx sensors and will struggle with the car for 3 years till he throws it away !!!

the only suggestion I have is after reading my other post find a bit more evidence re your specific engine then write to merc and the ombudsman and see if they throw 300 quid back at you

I read with interest incl yr coments on updates in another thread
Simply,for me ,when benz open up to correcting the emissions crxx that they built into our cars,and accept liability for the fixing of the unwanted side effects.I will get in the queue for it.
When I bought my car i bought something that supposedly did as in spec ,if maker wants to alter that spec ,because he lied in the first place all expenses involved in rectifying that and its consequences are down to him .whilst I dont wish to harm the environmentI am fd if I am going to see a grands worth plus of expenses to my account because he falsified emissions data . And as others until I am sure thats the case I not going near any update.
Now if benz say,come for update, its foc and any issues post update related to emissions will be foc I am heading for dealer these txxts created issue let THEM fix it properly.......

 

[Botus]

if you bought it new or secondhand, I presume you believed you bought something meeting the European laws in place for that type of product, and that the manufacture had dutifully fulfilled its obligations and produced a safe clean vehicle. In this case for emissions / animal wellbeing?

but many manu "deliberately" didn't meet those obligations, thus you, I presume unwittingly, have been breaking the law and endangering the planet we all live on

now that we know this. the car should be parked up and not allowed to be operated for any reason (like some countries mandated) and then only on license, allowed to drive to the nearest repair centre - to have ANY remedial work required until the vehicle meets the standards to which it was originally homologated (once that known and validated repair exists). Anyone using on public roads outside these should face severe penalties, up to an including jail.

The manufacturer at fault, once a vehicle is waiting for the repair. Should be fined for each mile it has traveled with dangerous and illegal emissions. For manufacturers of the scale of Ford, GM, Mercedes and VAG, I would be quite happy to see this fine be €100k per mile traveled on every vehicle that had illegal emissions the day it was sold. I would also like to see any employee involved in the engineering the illegality and or its cover up serve a 10 year jail sentence. With senior leaders getting a minimum 20 years.

Its a good thing I'm in a nice mood today, as we all ought to find those little penalties far to lenient...