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Knock Sensor needs replacing exhaust - quoted £1200!!!! :(

What would be interesting would be to hear what parameters are changed by the software updates. Are they simply to adapt the car electronics to a new design/manufacturer/operating parameters of the new NOx sensors or something peripheral like the temperature as signaled by that exhaust temperature sensor or the time delay to NOx sensor switch on [and thus presumably Adblue fluid addition] to protect them from moisture ?? In other words is increased reliability due to a new more robust sensor design or relaxing their operating window to reduce the chance of damage. Or maybe a bit of both?? :dk:

That's a question for Olly I'm afraid. My honest answer is I have no idea! Natacha :) Ill get him to reply later :)
 
Thing is if one supports Climate Change then it has to be paid for!.........austerity ....what twaddle!
 
I expect the software to adjust the operating parameters so it doesn't show a warning light. That is what they usually do!
 
I expect the software to adjust the operating parameters so it doesn't show a warning light. That is what they usually do!

I have just had this done yesterday. The dash light (CEL/EML sorry don't know which one) came one, took it in to my indie, he ran it on star and it showed it was the heater element relating to the adblue heater at fault. However, my indie stated the correct procedure to follow now oppose to replacing the heater, was to check for software updates and if one was available for the vehicle this should be carried out first to see if it resolves issues (no idea how).
A software update was available for our ML (2012 W166 circa 66k miles) and it was carried out......it worked :). Was advised to return immediately if the light returned as the heater would have to be replaced.

Contacted MB for a price on the heater. (part number A1664710775)....£573+VAT :eek:

It is actually a Bosch part (part number F01C600244) and can be sourced for circa £350 all in. These are for the ML W166 not sure if they are the same across the board.
 
Changing all these parts really helps the environment doesn't it :rolleyes:. This obsession with driving down what comes out of a cars exhaust pipe seems to help those who chase this mad agenda forget that NOx sensors Dpf's , catalytic converters and even the polyethylene container the AdBlue comes in have to be manufactured using the earths resources then packed and shipped all over the world. Making them and shipping them once in the lifetime of the car they are meant to be bolted onto once is bad enough, but having to repeat the whole eco unfriendly process possibly 3 times in the cars lifetime makes a mockery of the whole scam.

Did someone in the peanut gallery mention the batteries from electric cars ?? :dk: That's another story.
 
I should point out that the bluetec heater is part of the Adblue reservoir system but an entirely separate unit to the two discrete NOx sensors the subject of the OP
 
I should point out that the bluetec heater is part of the Adblue reservoir system but entirely separate unit to the two discrete NOx sensors the subject of the OP

My apologies if I have hi jacked this thread. I appreciate these are two separate units/systems but are linked are they not? I thought it may have been beneficial to others facing similar issues, as the OP has the same engine (albiet in a different car) and the system if not linked does seem to have an overlap.

Apologies OP :)
 
Scam being the appropriate word for sure !

Changing all these parts really helps the environment doesn't it :rolleyes:. This obsession with driving down what comes out of a cars exhaust pipe seems to help those who chase this mad agenda forget that NOx sensors Dpf's , catalytic converters and even the polyethylene container the AdBlue comes in have to be manufactured using the earths resources then packed and shipped all over the world. Making them and shipping them once in the lifetime of the car they are meant to be bolted onto once is bad enough, but having to repeat the whole eco unfriendly process possibly 3 times in the cars lifetime makes a mockery of the whole scam.

Did someone in the peanut gallery mention the batteries from electric cars ?? :dk: That's another story.
 
I can show you the document from MB in Germany about the software updates for NOX sensor replacement if you like?
I had an oxygen sensor replaced in the summer due to similar symptoms and it feels loads better but I do wonder if its 100% - I dont drive the car enough as its the Mrs' so I'm not sure. It still does the very occasional low speed bad change, and the MPG seems down. I wonder if it needed the software updating. It did throw an EML about 5 weeks ago but then nothing since. I'm wondering if the garage did the software update too?
 
Quote Petrol Pete said:
Changing all these parts really helps the environment doesn't it :rolleyes:. This obsession with driving down what comes out of a cars exhaust pipe seems to help those who chase this mad agenda forget that NOx sensors Dpf's , catalytic converters and even the polyethylene container the AdBlue comes in have to be manufactured using the earths resources then packed and shipped all over the world. Making them and shipping them once in the lifetime of the car they are meant to be bolted onto once is bad enough, but having to repeat the whole eco unfriendly process possibly 3 times in the cars lifetime makes a mockery of the whole scam.

Did someone in the peanut gallery mention the batteries from electric cars ?? :dk: That's another story. Quote.


I have done my bit for the environment, disconnected the sensor attached to the negative rail of the starter battery, this gets rid of stop/start, gets rid of smart charging and according to the link below extends the life of the expensive AGM battery , disconnecting the sensor also ensures the alternator aways attempts to fully charge the battery instead of smart charging it to 75%, by the way, does a 2015 SLK 200 petrol have a Nox sensor.

AGM aftermarket falters as drivers disable start-stop function - Batteries International
 
I have had both Nox sensors need replacing. I'm happy to say that Mercedes UK covered the full cost including diagnostics. My car has been out of warranty for a long time, it's a 64 reg with 41k on the clock. Local dealer vaguely accepted that this is a very common problem. Apparently I was told that because my car has been serviced regularly through Mercedes-Benz, I had more chances of Mercedes uk covering the cost and they did.
 
Just had the EML light come on the ML :( Booked in with indy for Monday to have fault codes read. I really hope it's not these sensors. It's a 2012 350, which I think is the same engine as yours OP, ours is around the 67k mileage mark.

Be interesting to see what response you get from your dealership.
I’m so glad that none of my cars have this light to come on , hence I don’t get these pesky faults .
 
Well, just joined this forum due to the nox issues. Had my engine warning light come on, was going on for a service with MB in Poole. Both sensors faulty, MB replaced FOC, thankfully! This was done on Friday. Warning light has just come on again this afternoon! So back to MB.
Btw it's a 64 plate e class e220 bluetec.
 
Well, just joined this forum due to the nox issues. Had my engine warning light come on, was going on for a service with MB in Poole. Both sensors faulty, MB replaced FOC, thankfully! This was done on Friday. Warning light has just come on again this afternoon! So back to MB.
Btw it's a 64 plate e class e220 bluetec.
These latest NOx Sensors require a software update when installed, perhaps they didn't do this ?
 
Thanks, will check with them, just glad I'm not paying and have a 2 year warranty on parts and labor!
 
Another NOx sensors failure here. But this is on a 350 petrol.

I’ve cancelled the codes a few times and the EML stays off for a while each time. How long it stays off appears to be dependent on the types of journeys. Sometimes it’s for a few days of just local journeys, other times it’s after 100 miles of “enthusiastic” mainly motorway driving. When the EML first comes on my simple code reader just shows 1 NOx failure; if left on it later shows 2 failures.

Not having a DPF of course, I’m wondering what harm, if any, will be done by delaying getting this repaired. Anyone know?

When the car was just coming to the end of its 3-year warranty the EML came on and I took it straight to the main dealer where I bought it new. They said they replaced an “oxygen sensor” - another name for a NOx sensor? That was about four years ago. The fuel consumption got a bit worse around that time; maybe coincidence or maybe the software change talked about here not being done. I don’t know. I don’t keep a careful check on fuel consumption, but it doesn’t seem to have got any worse since the EML first came on a couple of months ago.

Following on from the success stories I’ve read here, I plan on taking the car in to MB Peterborough when I have time. I bought the car new from there 7 years ago and have always had it serviced there. It’s still only covered 30k miles. Despite the car’s age, I would hope to get a sizeable contribution towards the cost, if not all. What do you think of my chances?
 

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