Originally Posted by Cwdawson

Sorry to hear of your issues, we also have a 2014 GLK250 (bought new) so far we has 3 issues with the NOX sensors (all fixed under warranty). We also had the inter cooler hose crack (the new one is a much better design ) and the drivers seat covering cracked, I did have the delete done and so far no more issues no NOX, DPF or any other issues to worry about while we do only have 150,000 klm on the car and hope to have this car until it dies hopefully far into the future.

Originally Posted by kenjraustin

Just a quick note here for anyone thinking about buying one of these.

Don't do it.

We've had ours for 7 years...it's honestly been a great vehicle. With the exception of the notorious DPF filter issue that MB is unwilling to cover under the 10 year mfg emissions warranty - we'd likely be MB customers for life.

Unfortunately, I'm now going to have to sell my 7 year old vehicle with less than 65k miles on it - a MB DIESEL...that should go for hundreds of thousands of miles - at well below blue book value because of this ridiculous Bluetec emissions system that they seemed to want to wash their hands of leaving their customers holding the bill.

Quick backstory....

About a year and a half ago we got a check engine light. Car drove fine - no issues. Take it to our local place that specializes in MB and they check the codes and tell me it's the DPF filter and warn me how expensive it is (~$4,000) and advise me to take to the dealer to see if they'll cover it under the 10 year mfg emission warranty. Well, of course they won't. And what's even more interesting is that their diagnosis wasn't even the same as my local shop - they seemed to indicate that it wasn't the filter itself but some kind of a sensor on the AdBlue tank. They still wanted almost $5,000 for parts and labor to cover the whole thing. I declined and even my service advisor said if it were him he would just leave it as is since it didn't affect the drivability or performance of the car.

Now here we are - last month my wife started telling me the car was driving strange - like a transmission issue. So, I go drive it and realize quickly that it's likely not a transmission issue as the car would shift through the gears - but it had no 'pep'. If you floored it it would perform as if you were doing a usual start from a stop. Interestingly, the paddle shifters wouldn't work anymore either. I figured that the ECM might need to be reset as this is one of those vehicles that 'learns' how you drive. Perhaps that got out of kilter over the years and needed to be reset.

So, we take it back to our local shop who hooks it up and calls me with new error codes. I'll paste what they sent me here for reference in case anyone searches through forum looking for this stuff:



This alone is almost $1k worth of labor and the part is $2,800.



This is another $600 in parts and labor -most likely due to the fact that the DPF is likely full or contaminated and the MAF sensed that and throttled back the performance of the car to protect the engine.

My wife and I are bummed - this car is paid for and we were hoping for at least 3 or 4 more years of service from it before moving on to something else - perhaps even longer if the car was still running well. We love just about everything about this vehicle except that MB seems to want nothing to do with working with Bluetec customers who are dealing with issues that they've know about for some time and then decided that they weren't going to cover them under any kind of extended warranty.

I remember when I bought this car and the salesperson asked me if we'd ever owned a MB before, and I answered No. He said, "Well you'll be one for life now...".

Nope. We're done.

Please do yourself a favor and don't buy one of these used. We decided not to spend the $6k primarily because this is just going to happen again. I'm not a fan of throwing good money after bad. We'll go look elsewhere and MB has lost our business for life.

Originally Posted by kenjraustin

Just a quick note here for anyone thinking about buying one of these.

Don't do it.

We've had ours for 7 years...it's honestly been a great vehicle. With the exception of the notorious DPF filter issue that MB is unwilling to cover under the 10 year mfg emissions warranty - we'd likely be MB customers for life.

Unfortunately, I'm now going to have to sell my 7 year old vehicle with less than 65k miles on it - a MB DIESEL...that should go for hundreds of thousands of miles - at well below blue book value because of this ridiculous Bluetec emissions system that they seemed to want to wash their hands of leaving their customers holding the bill.

Quick backstory....

About a year and a half ago we got a check engine light. Car drove fine - no issues. Take it to our local place that specializes in MB and they check the codes and tell me it's the DPF filter and warn me how expensive it is (~$4,000) and advise me to take to the dealer to see if they'll cover it under the 10 year mfg emission warranty. Well, of course they won't. And what's even more interesting is that their diagnosis wasn't even the same as my local shop - they seemed to indicate that it wasn't the filter itself but some kind of a sensor on the AdBlue tank. They still wanted almost $5,000 for parts and labor to cover the whole thing. I declined and even my service advisor said if it were him he would just leave it as is since it didn't affect the drivability or performance of the car.

Now here we are - last month my wife started telling me the car was driving strange - like a transmission issue. So, I go drive it and realize quickly that it's likely not a transmission issue as the car would shift through the gears - but it had no 'pep'. If you floored it it would perform as if you were doing a usual start from a stop. Interestingly, the paddle shifters wouldn't work anymore either. I figured that the ECM might need to be reset as this is one of those vehicles that 'learns' how you drive. Perhaps that got out of kilter over the years and needed to be reset.

So, we take it back to our local shop who hooks it up and calls me with new error codes. I'll paste what they sent me here for reference in case anyone searches through forum looking for this stuff:



This alone is almost $1k worth of labor and the part is $2,800.



This is another $600 in parts and labor -most likely due to the fact that the DPF is likely full or contaminated and the MAF sensed that and throttled back the performance of the car to protect the engine.

My wife and I are bummed - this car is paid for and we were hoping for at least 3 or 4 more years of service from it before moving on to something else - perhaps even longer if the car was still running well. We love just about everything about this vehicle except that MB seems to want nothing to do with working with Bluetec customers who are dealing with issues that they've know about for some time and then decided that they weren't going to cover them under any kind of extended warranty.

I remember when I bought this car and the salesperson asked me if we'd ever owned a MB before, and I answered No. He said, "Well you'll be one for life now...".

Nope. We're done.

Please do yourself a favor and don't buy one of these used. We decided not to spend the $6k primarily because this is just going to happen again. I'm not a fan of throwing good money after bad. We'll go look elsewhere and MB has lost our business for life.

Originally Posted by 100Pyatt

Late now but unfortunately this sounds exactly like the common boost leak from ruptured rubber intercooler hose problem