2015 GLK 250 DEF System
MBWorld Fanatic!
Joined: Jul 2012
Posts: 1,369
Likes: 319
From: WI
GLK 250
Likely, yes. But to quantify the effect is another matter. From my understanding, there are both passive and active DPF regenerations that take place. The active ones you can usually tell when they're running, especially if you're stopped at a light. The passive regens are almost impossible to detect unless you have some gauges to monitor EGTs, DPF pressure and soot load, etc.
Here's the kicker: from what I can tell, passive regens don't require AdBlue/DEF. Just a bit more fuel being injected to heat up the DPF nice and hot in order to blast it clean. Wifey being the main driver, she has a mostly freeway commute in which the Bluetec, ahem, stretches its legs pretty good. I think that's why the average distance between active DPF regens has been about 600 miles. These Bluetecs hate short trips, stop-n-go, never getting exercised properly.
FWIW, I've got 2 versions of tuned software at the moment. One turns off the DEF system (since my AdBlue heater conked out...) and the other doesn't. Once winter temps are past I'll load the version that uses AdBlue and give the DPF a good scrubbing. Until then, it will only be getting passive regens and freeway blasts.
YMMV
Here's the kicker: from what I can tell, passive regens don't require AdBlue/DEF. Just a bit more fuel being injected to heat up the DPF nice and hot in order to blast it clean. Wifey being the main driver, she has a mostly freeway commute in which the Bluetec, ahem, stretches its legs pretty good. I think that's why the average distance between active DPF regens has been about 600 miles. These Bluetecs hate short trips, stop-n-go, never getting exercised properly.
FWIW, I've got 2 versions of tuned software at the moment. One turns off the DEF system (since my AdBlue heater conked out...) and the other doesn't. Once winter temps are past I'll load the version that uses AdBlue and give the DPF a good scrubbing. Until then, it will only be getting passive regens and freeway blasts.
YMMV
Thread Starter
Senior Member
Joined: Feb 2010
Posts: 250
Likes: 15
From: Miami, FL
2009 E63
Likely, yes. But to quantify the effect is another matter. From my understanding, there are both passive and active DPF regenerations that take place. The active ones you can usually tell when they're running, especially if you're stopped at a light. The passive regens are almost impossible to detect unless you have some gauges to monitor EGTs, DPF pressure and soot load, etc.
Here's the kicker: from what I can tell, passive regens don't require AdBlue/DEF. Just a bit more fuel being injected to heat up the DPF nice and hot in order to blast it clean. Wifey being the main driver, she has a mostly freeway commute in which the Bluetec, ahem, stretches its legs pretty good. I think that's why the average distance between active DPF regens has been about 600 miles. These Bluetecs hate short trips, stop-n-go, never getting exercised properly.
FWIW, I've got 2 versions of tuned software at the moment. One turns off the DEF system (since my AdBlue heater conked out...) and the other doesn't. Once winter temps are past I'll load the version that uses AdBlue and give the DPF a good scrubbing. Until then, it will only be getting passive regens and freeway blasts.
YMMV
Here's the kicker: from what I can tell, passive regens don't require AdBlue/DEF. Just a bit more fuel being injected to heat up the DPF nice and hot in order to blast it clean. Wifey being the main driver, she has a mostly freeway commute in which the Bluetec, ahem, stretches its legs pretty good. I think that's why the average distance between active DPF regens has been about 600 miles. These Bluetecs hate short trips, stop-n-go, never getting exercised properly.
FWIW, I've got 2 versions of tuned software at the moment. One turns off the DEF system (since my AdBlue heater conked out...) and the other doesn't. Once winter temps are past I'll load the version that uses AdBlue and give the DPF a good scrubbing. Until then, it will only be getting passive regens and freeway blasts.
YMMV
MBWorld Fanatic!
Joined: Jul 2012
Posts: 1,369
Likes: 319
From: WI
GLK 250
There is no AdBlue/DEF being used for passive regens, only slightly more fuel being used to increase EGT and burn off the accumulated soot.
At least that’s the idea. Active regens require DEF to catalyze and drive the reaction of scrubbing the NOX particles that accumulate in the DPF into harmless particulates that can then be cleared.
Think of the DPF as a trap which requires periodic cleaning/clearing. A thorough cleaning is achieved using DEF and active regens at longer intervals, while an “ok” cleaning is achieved with passive regens using just fuel and heat, in between those active ones.
At least this is my understanding.
At least that’s the idea. Active regens require DEF to catalyze and drive the reaction of scrubbing the NOX particles that accumulate in the DPF into harmless particulates that can then be cleared.
Think of the DPF as a trap which requires periodic cleaning/clearing. A thorough cleaning is achieved using DEF and active regens at longer intervals, while an “ok” cleaning is achieved with passive regens using just fuel and heat, in between those active ones.
At least this is my understanding.
Thread Starter
Senior Member
Joined: Feb 2010
Posts: 250
Likes: 15
From: Miami, FL
2009 E63
Well, I took it to the dealer. This car has had the DPF and NOX sensors replaced under warranty, however I received the “10 starts remaining” message. Took it to the dealer, verified the adblue level was good (it was full) and that it hadn’t lost its chemistry? But all checked good. Apparently there were a couple of codes for NOX and other related items, but they followed steps that the repair computer told them too and all led to a software update to different modules. They reset it and drove it for approximately 100 miles and nothing came back up.
i guess all I can do is wait now. Has anyone had a similar experience with successful results?
i guess all I can do is wait now. Has anyone had a similar experience with successful results?
Thread Starter
Senior Member
Joined: Feb 2010
Posts: 250
Likes: 15
From: Miami, FL
2009 E63
andreigbs, no mention on what modules exactly were updated, but I it did take them of day of messing around.
otherwise it’s running fine. I might just buy the def delete module and have it just in case we’re out on the road and it starts messing around. Might be peace of mind?
otherwise it’s running fine. I might just buy the def delete module and have it just in case we’re out on the road and it starts messing around. Might be peace of mind?
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MBWorld Fanatic!
Joined: Jul 2012
Posts: 1,369
Likes: 319
From: WI
GLK 250
Probably best to start with a good quality, MB-specific scan tool first. That way you can check things yourself, even force a regen if you need to. You can buy one for $150 or less.
As for deleting AdBlue, that's a different task entirely and there are several options but they're mostly all costly. If the system continues to work well post-updates, just make sure to keep the DEF topped up and motor on. Based on your climate, you're likely to never have the AdBlue heater go out since it'll never be needed. That's what failed on mine (and on many others in the past) that costs thousands to fix at the dealership, only to have it fail potentially again.
As for deleting AdBlue, that's a different task entirely and there are several options but they're mostly all costly. If the system continues to work well post-updates, just make sure to keep the DEF topped up and motor on. Based on your climate, you're likely to never have the AdBlue heater go out since it'll never be needed. That's what failed on mine (and on many others in the past) that costs thousands to fix at the dealership, only to have it fail potentially again.
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