CEL & Nox sensor
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Joined: Jun 2014
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2014 GLK250, 1983 Caterham super 7
CEL & Nox sensor
Well we had the dreaded Check Engine Light come on (after 3 years of ownership & 34,000 miles) while on holiday on the Oregon coast followed by the DEF 10 start countdown. Went to Oreilly auto and they read the fault code (P229F) called MB of Eugene. they had the parts on hand and got me in the same day.
the service manager explained that the Sprinters have been having the same issues. he said that MB engineers found that the communication modules that both up & down stream Nox sensors are connected to had an out of spec run by the sensor manufacturer and when an individual sensor was replaced the two sensors became incompatible. And hence the repeated faults. The fix seems to be that they have to replace both sensors from the bad sensor run with certified compatible new sensors to then ensure that they communicate properly. New software was also installed.
Kudos to MB of Eugene for getting me in within two hours of calling them. Repair took two hours. On the two hour drive back from Eugene to where our motor is parked we experienced no more issues.
the service manager explained that the Sprinters have been having the same issues. he said that MB engineers found that the communication modules that both up & down stream Nox sensors are connected to had an out of spec run by the sensor manufacturer and when an individual sensor was replaced the two sensors became incompatible. And hence the repeated faults. The fix seems to be that they have to replace both sensors from the bad sensor run with certified compatible new sensors to then ensure that they communicate properly. New software was also installed.
Kudos to MB of Eugene for getting me in within two hours of calling them. Repair took two hours. On the two hour drive back from Eugene to where our motor is parked we experienced no more issues.
Last edited by super7pilot; Oct 4, 2016 at 12:18 AM.
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2014 GLK250, 1983 Caterham super 7
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2014 GLK250
I hardly see this as fortune telling, but rather an Achille's heel of these cars, which would explain why, when a sensor failed on mine, the dealer actually replaced both of them - I now know why.
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2014 GLK250, 1983 Caterham super 7
Hugo, That might or might not be what Les meant. And I don't really care. There are plenty of other threads here in this forum about the certain meltdown of all GLK250's. He can go there to preach of the coming apocalypse for GLK owners.
I started this thread to show that I had found an explanation by MB that they have (allegedly) discovered why the Nox sensors have been acting up and that this might be usefull info for those in the future that get the CEL and 10 start count down. Or are having the issue again after a single Nox sensor replacement prior to this new development. As well as the great service that MB of Eugene provided me on very, very short notice.
I started this thread to show that I had found an explanation by MB that they have (allegedly) discovered why the Nox sensors have been acting up and that this might be usefull info for those in the future that get the CEL and 10 start count down. Or are having the issue again after a single Nox sensor replacement prior to this new development. As well as the great service that MB of Eugene provided me on very, very short notice.
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2014 glk 250BT (RIP, 3/1/17}, 2010 C300
Thanks for your reply Hugo L. I see you can read with comprehension of the issue. After replacing the sensors on all four cylinders on 4 different dealer visits with this car and two other visits for my first 250 then maybe I would have had a different view.
Apparently Super7pilot you don't get it, I'm talking from experience. Why did I buy a second GLK after the same problems with my first?
And no the sky isn't falling, you don't have to run an hide from the apocalypse.
Apparently Super7pilot you don't get it, I'm talking from experience. Why did I buy a second GLK after the same problems with my first?
And no the sky isn't falling, you don't have to run an hide from the apocalypse.
Last edited by LesF; Oct 4, 2016 at 11:28 PM.
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2014 GLK250, 1983 Caterham super 7
Thanks for your reply Hugo L. I see you can read with comprehension of the issue. After replacing the sensors on all four cylinders on 4 different dealer visits with this car and two other visits for my first 250 then maybe I would have had a different view.
Apparently Super7pilot you don't get it, I'm talking from experience. Why would I buy a second GLK after the same problems with my first?
And no the sky isn't falling, you don't have to run an hide from the apocalypse.
Apparently Super7pilot you don't get it, I'm talking from experience. Why would I buy a second GLK after the same problems with my first?
And no the sky isn't falling, you don't have to run an hide from the apocalypse.
I got it Les. I just didn't think it belonged in this particular thread. There are other GLK's suck threads to post yours as well as others displeasure. And that is fine.
I started this thread to say I had the sensor issue and MB said they figured out what the issue was. To that end. I posted that info so that other's can go into their MB service center with a bit of knowledge in case their particular dealer lacked that knowledge. Not to start yet another GLK's suck thread.
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2014 GLK250
I, for one, don't think the car sucks.
But as I said, I understand now why both sensors were replaced, and in case I thought about cutting corners and skipping on that, Les's post would educate me as to why I shouldn't.
I see it this way : in the end, both posts are somewhat complementary, even though that was not the intention you had starting the thread.
It's always a good thing to do a search with «Nox» or whatever and stumble upon, among others, this thread and know what can be expected.
But as I said, I understand now why both sensors were replaced, and in case I thought about cutting corners and skipping on that, Les's post would educate me as to why I shouldn't.
I see it this way : in the end, both posts are somewhat complementary, even though that was not the intention you had starting the thread.
It's always a good thing to do a search with «Nox» or whatever and stumble upon, among others, this thread and know what can be expected.
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GLK250
nox sensor 0009053403
i got the DEF10 on my glk250 2013
mercedes dealer service replaced upstream sensor total cost with tax $1119,17
pretty expensive for 1 sensor hope the other will last longer since there are 2 on this model
mercedes dealer service replaced upstream sensor total cost with tax $1119,17
pretty expensive for 1 sensor hope the other will last longer since there are 2 on this model
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2014 GLK250
The heating element in my DEF tank got replaced, but intermitently my car now throws P203B and P203D codes.
As long as I can tho, I will keep erasing that code. No more expenses for the time being.
As long as I can tho, I will keep erasing that code. No more expenses for the time being.
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From: WI
GLK 250
Hugo: P203B relates to implausible signal from the Reductant Level Sensor, and P203D relates to Reductant Level Sensor Circuit High.
Maybe just keep the DEF level topped off? I wonder if perhaps there's a nicked wire post heater replacement work.
Ghkela: you can try iCarsoft for Mercs, or Carly with an appropriate OBD adapted, or what I use: BlueDriver.
Maybe just keep the DEF level topped off? I wonder if perhaps there's a nicked wire post heater replacement work.
Ghkela: you can try iCarsoft for Mercs, or Carly with an appropriate OBD adapted, or what I use: BlueDriver.
