I own a 2008 E320 Bluetec and have noticed that MB Diesel owners talk a lot about EGRs for these Diesel cars.
Many of them say that bad EGRs cause damages to the DPF in these cars.
Only to know better, what are the symptoms of a bad EGR on E320 Bluetec?
Thanks.

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Nyck - TX - USA

The EGR can get stuck. On the sedan it’s pretty easy to get to. A couple bolts and then it pulls out of the housing. Gentle taps with a rubber mallet helped when I had to pull it for the oil cooler seal job.

If you get access to a diagnostic system you can run a guided test on the EGR valve to see if it is functioning correctly.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Does the 08 even have dpf?
A failed EGR valve puts the car into limp mode.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

Yes this era of the 642 has a catalyst just past the turbo and a DPF located under the body.

Both my 2008 E320 (W211) and 2008 ML320 (W164) have this same setup.

Note that even though 2007-2009 W211s with the 642 are badged Bluetec, they do not have an SCR or use DEF.

In the transition to W212 (sedan) and W166/X166 (SUV) in 2010 they added the SCR which uses the DEF fluid to the other items in the exhaust train.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Yes, the 2008 has DPF and by the way I had my removed and professionally cleaned.
My concern about EGR is because I read in many articles about DPF where sais that a bad EGR will cause the DPF to clog very quick.
As DPF is very expensive I want to make sure that my EGR is working properly.

__________________
Nyck - TX - USA

Sorry - I deleted my post due to realizing it was based on a major brain-fart.

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Current rolling stock:
2001 E55 183,000+ Newest member of the fleet.
2002 E320 83,000 - The "cream-puff"!
1992 500E 217,000+
1995 E300D 412,000+
1998 E300D 155,000+
2001 E320 227,000+
2001 E320 Wagon, 177,000+

Prior MBZ’s:
1952 220 Cab A
1966 300SE
1971 280SE
1973 350SLC (euro)
1980 450SLC
1980 450SLC (#2)
1978 450SLC 5.0
1984 300D ~243,000 & fondly remembered
1993 500E - sorely missed.
1975 VW Scirocco w/ slightly de-tuned Super-Vee engine - Sold after 30+ years.