Nox sensor

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Bebi28

New Member
Joined
Dec 14, 2023
Messages
9
Location
Maidstone
Car
Mercedes c class Ang line
Hi everyone
I’m new here,hopefully someone can give me some advice.
I purchased second hand,approved used Mercedes c class amg line,it came with one year warranty from Mercedes.
6-7 weeks after I purchased,amber engine management come on.I took it to local Mercedes dealer,after their diagnostic (I knew what was wrong as my mechanic did the diagnostic) they told me both nox sensors need replacing,they are covered by warranty (was a relief at the time)
But,they said wiring is not covered so is going to cost me £541 only for wiring 🤔
I told them ,can you just replace the sensors ,don’t worry about wiring,but they wouldn’t have it,is part of the job,can’t do sensors without wiring.
I had a look on warranty paper work,it does say,wiring not covered so that is the trick with Mercedes.
Spoken with mechanic,he is telling me no way wiring cost £540 pounds…..
If someone please has been to similar situations,please some advice to avoid paying £540,as I’m sure to have the car for 6-7 weeks the fault already there and this warranty thing is a con I think.many thanks Indrit
 
Hello and welcome .

I can't help you with the 'wiring' thing , but this sounds like sharp practice at best. Could it be that MB know the sensors will fail (of course they do , it's a common fault) so in a possible attempt to cut their warranty repair cost they insist on the customer paying for 'wiring' ?

Bebi , I'm sure we have more than a few members on here who have had Nox sensor problems and will soon advise.
 
My local MB dealership has replaced the NOx sensors three times on my C350 cgi and there’s never been any mention of wiring.

Even if there was a need to replace any wiring, I fail to understand why it’s not covered by a Mercedes warranty. If wiring is now considered to be a normal wear item, we’re all in deep brown smelly stuff.
 
Wiring is not normally covered in most after market warrantees........its nothing new...was the same between 87 and 2005 when I was selling cars. You can get cover for anything if you pay the money.....but its probably not worth it.....and the 12 month warranty the dealers tend to give will only be the lower or middle level of cover available.
That's said if its been les than 6 months after purchase the law will assume the fault was there when purchaesed....so they are obliged to correct it for you. Bare in mind that the warranty they give you is in addition to your statutory rights under the Consumer Rights Act 2015....and don't be fooled into thinking its there to cover you......oh no....its to cover them and keep any warranty repairs cost to a minimum FOR THEM!!

What are my rights after 30 days?

If a problem is found after 30 days, but within six months of purchase, you can request a repair or a replacement vehicle. The onus is on the seller of the car to prove the fault wasn’t present when the car was sold; if they can, and you’re likely to have known about it, you won’t get a refund.

When it comes to repairs, the dealer has one chance to fix the fault. If the fix doesn’t work, you are entitled to a refund. You won’t get the full purchase price back, though. Any usage of the car will be taken into account and the refund will be adjusted accordingly.
 
Hello and welcome .

I can't help you with the 'wiring' thing , but this sounds like sharp practice at best. Could it be that MB know the sensors will fail (of course they do , it's a common fault) so in a possible attempt to cut their warranty repair cost they insist on the customer paying for 'wiring' ?

Bebi , I'm sure we have more than a few members on here who have had Nox sensor problems and will soon advise.
That’s what I thought straight when they told me
 
My local MB dealership has replaced the NOx sensors three times on my C350 cgi and there’s never been any mention of wiring.

Even if there was a need to replace any wiring, I fail to understand why it’s not covered by a Mercedes warranty. If wiring is now considered to be a normal wear item, we’re all in deep brown smelly stuff.
That’s why i said is a con all this warranty thing
 
Wiring is not normally covered in most after market warrantees........its nothing new...was the same between 87 and 2005 when I was selling cars. You can get cover for anything if you pay the money.....but its probably not worth it.....and the 12 month warranty the dealers tend to give will only be the lower or middle level of cover available.
That's said if its been les than 6 months after purchase the law will assume the fault was there when purchaesed....so they are obliged to correct it for you. Bare in mind that the warranty they give you is in addition to your statutory rights under the Consumer Rights Act 2015....and don't be fooled into thinking its there to cover you......oh no....its to cover them and keep any warranty repairs cost to a minimum FOR THEM!!

What are my rights after 30 days?

If a problem is found after 30 days, but within six months of purchase, you can request a repair or a replacement vehicle. The onus is on the seller of the car to prove the fault wasn’t present when the car was sold; if they can, and you’re likely to have known about it, you won’t get a refund.

When it comes to repairs, the dealer has one chance to fix the fault. If the fix doesn’t work, you are entitled to a refund. You won’t get the full purchase price back, though. Any usage of the car will be taken into account and the refund will be adjusted accordingly.
I understand now all this warranty nonsense,I soppose is just luck if you buy second hand car as if it comes with warranty hardly covers anything for free.Just I want people to be aware before they buy
 
I understand now all this warranty nonsense,I soppose is just luck if you buy second hand car as if it comes with warranty hardly covers anything for free.Just I want people to be aware before they buy
I suggest that you re-read post number 4. It is good advice.
You do not need to be pushed around by the terms of their warranty.
Tell them that they are responsible under the Consumer Rights Act 2015 to fix the fault within the first 6 months and that their warranty exclusions do not apply. If they don't want to fix it foc that's fine you will have your money back. Better to write to the dealer principal than have phone calls with receptionists.
 
To put what ALFAitalia said another way, tell them that you are not interested in what the warranty offers, and that you are asking them to correct a pre-existing defect under your consumer rights and the law, and that you would like them to offer either a repair or a replacement.

They might not be lying that the warranty doesn't cover wiring, but this is an immoral distraction tactic to try and trick you into letting them off the hook in not complying with the law.

Set this out to the dealer manager and say you will also follow this request up in writing. Then send via email. If you get wrong response, send it in via recorded mail and give them two weeks to respond and keep reminding them that you are only looking for them to comply with their obligations under consumer law.

Sounds like a right shower of scumbags who operate this dealership.

Edit: I see I typed this to essentially repeat the advice above. For some reason the page didn't load the post above when I first looked at it. Sorry Smiley, I wasn't trying to repeat or restate.
 
That’s why i said is a con all this warranty thing
The MB used warranty is actually really good , I think you are maybe getting some bad treatment from the dealership ?
 
I suggest that you re-read post number 4. It is good advice.
You do not need to be pushed around by the terms of their warranty.
Tell them that they are responsible under the Consumer Rights Act 2015 to fix the fault within the first 6 months and that their warranty exclusions do not apply. If they don't want to fix it foc that's fine you will have your money back. Better to write to the dealer principal than have phone calls with receptionists.
Thanks, will try to contact them, I will update the outcome,hopefully I will get somewhere 🤞
 
Ive just had my downstream nox sensor changed yesterday at local independent merc outfit and it cost me £451 all in. There was no mention of any wiring needing to be replaced, just the sensor itself.
Sounds like MB trying to claw back money by changing wiring unnecessarily so.
 
I've heard of the loom chafing through near where it plugs in to the AdBlue tank on the W205. I'd be requesting more details from the dealer as to what the exact issue is.
 
Maybe get a second opinion from a specialist
 
Ive just had my downstream nox sensor changed yesterday at local independent merc outfit and it cost me £451 all in. There was no mention of any wiring needing to be replaced, just the sensor itself.
Sounds like MB trying to claw back money by changing wiring unnecessarily so.
I did call them,I asked would you give me a quote on wire only not the sensor,they told me they don’t sell them separately,they come together.
When it comes to warranty wiring is not covered 😂😂
 
To put what ALFAitalia said another way, tell them that you are not interested in what the warranty offers, and that you are asking them to correct a pre-existing defect under your consumer rights and the law, and that you would like them to offer either a repair or a replacement.

They might not be lying that the warranty doesn't cover wiring, but this is an immoral distraction tactic to try and trick you into letting them off the hook in not complying with the law.

Set this out to the dealer manager and say you will also follow this request up in writing. Then send via email. If you get wrong response, send it in via recorded mail and give them two weeks to respond and keep reminding them that you are only looking for them to comply with their obligations under consumer law.

Sounds like a right shower of scumbags who operate this dealership.

Edit: I see I typed this to essentially repeat the advice above. For some reason the page didn't load the post above when I first looked at it. Sorry Smiley, I wasn't trying to repeat or restate.
Thank you for your advice,I will try to follow this way,hopefully I will get there 🤞
 
ALFAitalia and MrGreedy have posted the best advice for this issue - consumer rights all the way!
Also to add - if the dealer doesn't fix it the first time, you can take it elsewhere and claim the cost back from the dealer. I did this with a £1200+ bill for a Freelander2 successfully. You have to pay the folk that fixed it but the supplying dealer is liable for the full.cost.
 
Thanks, will try to contact them, I will update the outcome,hopefully I will get somewhere 🤞
Hi,just an update about Knox sensor.
Thank you very much for your advice,somehow it did work about consumer act 2015.
After few emails exchange between myself and the dealer where I purchased the car, I did copy the head office of Mercedes Benz,they were very helpful.
After the problem was solved by local dealer,they paid full invoice.
So thanks again for your help otherwise I was few hundreds pounds short now.
 
Just an update about Knox sensors.
After few emails between myself and the dealer where I purchased the car, I did copy Mercedes head office on every email though and they were very helpful.
Finally the car was fixed by local Mercedes dealer and the dealer where I purchased the car paid full invoice.
So thank you everyone here as without your help or advice I could have been few hundreds pounds short now.
So don’t forget anyone,consumer act 2015 does work when you purchase something,do use it.
Many thanks again
 

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