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CDI DPF actually bad?

 
Old 07-11-2019, 07:11 PM
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E350 Sport W212, Previous CLK500 W209
CDI DPF actually bad?

My parents own an 07 ML320 CDI. She just broke 110K miles. They bought the vehicle used a few years ago as a one owner low miles (50K at the time) a few years ago. The SUV had to be taken into our indy as it kept entering a limp home mode. Our indy is saying the DPF filter is clogged and will need to be either professionally cleaned or replaced.

I have read through dozens of threads on here and benzworld. However I have ruled out a few items as they been done recently or are still in good condition. When they purchased the vehicle the dealer had just replaced and updated the oil cooler, they serviced the transmission and update the software along with replacing the valve body. At the time I only heard and knew of those two items being the biggest issue. I probably should have researched a bit better. Our indy is a prior MB Tech and only uses original parts including vehicle specific oil and fluids from the dealer so with that being said the correct oil was being used and prior to their ownership it was a dealer maintained vehicle with no expense spared (hoping the dealer was using correct fluids as well).

Since they have owned the car it's been used as my father's daily commuter doing roughly 140 miles daily. Turbo actuator replaced, glow plugs replaced, fuel filter replaced every other service and he refuels at the same Shell station religiously. My father also has a bit of a heavy foot so it's not being putted around.

So this brings me back to the topic of discussion. I asked our indy if the DPF is truly clogged and if the sensor isn't the issue. He explained they tested the signal and ran the sensor through his MB computer and all checked out. I asked my parents about ever seeing a weird dash light in regards to the regeneration taking place and neither have ever seen it come on or notice any of the symptoms of regen working. I use the SUV regularly as well and have never seen or notice regen in action. I am bit lost as it's a hard pill to swallow having to pay $2K on replacing the DPF filter on a 13 year old vehicle. Any ideas of what we can look into diagnosing the issue or tips on forcing the regen to start if it's truly the issue.
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Old 07-11-2019, 11:34 PM
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'07 GL320CDI, '10 CL550
There is no light to indicate regeneration is in progress. There are probably failure codes, but I haven’t studied them. Problems that illuminate check engine lights indicate the vehicle is polluting more than allowed, so sure seems logical there would be a code for failure to regen.

my ‘07 GL is pretty low mileage and when I asked service advisor when dpf replacement is likely he suggested 100k miles. Also said cleaning instead not a good option ... he would of course but I don’t doubt he’s correct.

as for replacement cost, you’ll either pay to have it done or it will come off what you get selling the vehicle. It was warranted to 80k miles/8 years, which is federally required for emissions equipment. This is part of the diesel experience ... gasoline fuel injectors aren’t $700 each, either.

Last edited by lkchris; 07-11-2019 at 11:37 PM.
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Old 07-12-2019, 03:02 PM
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Ducati
What code is it throwing?
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Old 07-13-2019, 02:37 PM
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E350 Sport W212, Previous CLK500 W209
Originally Posted by justinwrock View Post
What code is it throwing?
That's the weird thing I didn't have chance to scan it. Our indy said that is was throwing a code fo DPF, the last time it entered limp mode there was no CEL just pulled over restarted the truck after a few minutes and we were back on the road. I'm going to look at the air filter and some sensors today then go on a drive to see if the CEL comes on to scan it my self. It's been driving fine since we picked it up on Thursday.
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Old 07-13-2019, 09:19 PM
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'07 GL320CDI, '10 CL550
An air filter change on these diesels requires a computer reset.
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Old 07-14-2019, 07:48 AM
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2008 gl320cdi
Or tune and pipe/gut. Many happy with GDE and others.

At a minimum you can save money and run a better protecting oil.

Last edited by smiledr996s; 07-14-2019 at 07:51 AM.
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Old 07-15-2019, 10:35 AM
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Ducati
There's a few codes that mention DPF (like for temperature sensors and pressure sensors) that might be mistaken for a bad DPF.
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