Hello,

I have GLK 250 Bluetec. Got 3 codes with check engine light:
1. P24AF
2. P2002 ( DPF Filter efficiency low)
3. P2459 Diesel Particulate Filter Regeneration

Does anyone know is P24AF about?

Also before this code I had P2081 - Exhaust gas temp sensor code. This was fixed by replacing the temp sensor that goes before the turbo. Once this was fixed I got P2002. I am kind of wondering if there is any relation between a failed exhaust gas temp sensor and DPF. Would DPF regeneration cycles have not run because the exhaust gas temp sensor had gone bad?

 

You would not be the first one to have the DPF fill prematurely. If you are in the US then take it to the dealer - it should be covered by the 8 year, 80K miles emissions warranty.

 

I have the P2002 code and my dealership told me that device isn't covered under warranty.

 

Some dealers are better than others in handling these issues. It should be covered. Try a different dealer.

 

Unfortunately it isn't covered in North or South Carolina. I'm going to try and have a technician force a manual regeneration. If that does't work I'm going to have it removed for cleaning and baking. I'm not certain this will be successful. I wonder if there are any positive reports of cleaning and baking?

 

I just had mine replaced under the 80k 8yr warranty. My car is just about 74k miles into it’s life as a 2015.

Dealer swapped SCR and DPF due to that dpf low efficiency code. That is the only code my car would have though. Call mbusa if your dealer is not wanting to live up to that warranty.

 

Unfortunately I did call mbusa. No dice.

 

You need a MB specific scan tool can force regens to take place. When new sensors are installed, the car has to "learn" that they're new and working properly, then it should cycle through the DPF regen. This doesn't happen instantly. Now that you've replaced a temp sensor, get it out on the open road nice and hot, cruising at least 60 and use the scan tool to force a regen.

Additionally, get a couple cans of this and run them with a full tank of diesel. It has helped a few folks I've talked to in the past.

 

Yes, I have a technician doing all that work. I'm really hoping I don't have to purchase a new DPF.

 

Update. The technician forced the regeneration through his software and followed all appropriate steps. The regeneration was successful and the code is erased. He test drove it and confirmed success. Afterwards I took it on a 110 mile trip back to my daughter. Everything seems back to normal. Cruised at 80 the whole way back with an indicated mileage of 33 mpg. I believe she's good to go. At one point early in the trip I thought a smelled a sulfur smell for about 10 minutes. I wonder if that was another regeneration? Does anyone else ever get a slight whiff of odor during the cycle? I just don't drive the car that often to know. Thanks for any and all input.

 

Good that it's fixed. You never really know for how long with these complex exhaust systems. I'd still get a few cans of that DPF protector stuff from LiquiMoly, use it every several thousand miles.
There are active and passive regens, they take place at set inervals. In our case, we'd get through 600-700 miles between active regens. It's normal to detect some extra smells if you're in the middle of one and are at a stop. Passive regens are mostly undetectable, unless you have a scan tool hooked up and can see certain parameters change. You won't smell anything.
The best "lifestyle" for these Bluetecs is the open road at constant speeds. They hate short-tripping, not getting up to temp properly, stop-n-go traffic crawls and the like. You should be able to get at least 150,000 miles out of a properly operating DPF, before you have to worry about a true deep clean like the big rigs do every 200,000 miles or so. Use good quality diesel, don't pu$$yfoot it, give it 229.51 spec or better oil and it should be a reliable beast for many years.

 

Thanks for the comments.

 

Well that was quick. CEL is back on. Not sure the code but I think I know already. Replace or clean? That is the question.