Catalytic Converter or Diesel Particulate Filter?

[nyko46]

Recently my 2008 Mercedes Benz E320 Bluetec issued a engine light and when scanned gave the codes: P0471 and P0242F both related to DPF restriction.
As this car had an unsuccessfully cleaned DPF I then decided to buy a new one to have it replaced. The new DPF was sold by and accredited MB auto parts store which sold a part with two numbers on it: one sticker with P# A 211 490 07 81. In the same part was also engraved P# A 211 490 30 36.
Both numbers with the MB logo and "Made in Germany" on it.
This part is connected directly to a turbo down to the exhaust pipe.
Today when the exhaust repair shop was working on it the mechanic found another accessory in line after the new DPF which seems more to be the real DPF. This accessory, similar to a "catalytic converter" has two small (6 mm) stainless tube and one sensor (?) connected to it. Also from this part is where the two exhaust pipes (muffler?) goes to the rear end of the car.
Is this accessory the real DPF or both of them work together as DPF?
When I was to buy the DPF who was installed today, I called a MB dealer parts dept. and they told me that I was buying the right part and also they said that "DPF and Catalytic converter" are the same thing on MB cars.
I know that the part installed today has a filter inside because it is very visible when looking inside.
Now I am confused if my installed part is or not the real DPF and also not knowing what part is that after the new one installed today.
Can someone help me to identify these parts and let me know if I installed the correct part to resolve my issue with the restrict DPF?
The mechanic cleared the "engine light " but it came back with the same DPF codes.
The two pictures are from the part in question, not the one installed today.

[engatwork]

The terminology is somewhat convoluted in my opinion. I had an 09 in the shop with plugged dpf and both items that you have pictured ended up having to be replaced.

[SkippyJasper]

Hoping this picture and component description helps.

Skippy

GF14.40-P-2010GZ Component Description For Diesel Particulate Filter
ENGINE 642 in MODEL 164.8 /1
with CODE (474) Particulate filter up to Model Year 2008 / YoM 07 ENGINE 642 in MODEL 463 up to 31.5.12



Shown on model 164




18 Primary catalytic converter
19 Oxidation catalytic converter
21 Muffler
114 Diesel particulate filter (DPF)

Location
The DPF is located at the center at the vehicle underfloor.


Sent from my iPad using Tapatalk

[ROLLGUY]

The DPF will always have two small tubes on it, one before, and one after. Both tubes connect to the differential pressure sensor, which senses the pressure difference from the inlet and outlet of the DPF. The DPF may have one or two oxygen sensors on it as well. A catalytic converter does not have the small tubes or pressure sensor.

[nyko46]

Originally Posted by ROLLGUY

The DPF will always have two small tubes on it, one before, and one after. Both tubes connect to the differential pressure sensor, which senses the pressure difference from the inlet and outlet of the DPF. The DPF may have one or two oxygen sensors on it as well. A catalytic converter does not have the small tubes or pressure sensor.

Thanks, very useful information.
Then I was told wrong by the Mercedes Benz dealer. He told me that the DPF was the #18+19 in this schematic.
Can some of the tubes be clogged and not letting the sensor to read the pressure difference and not allowing the DPF self cleaning not to work?
Anyway, I should then remove and clean or replace the DPF who has the tubes on it, correct?

[engatwork]

No, he is calling it the name MB put on it. When I was trying to help customer I found their naming quite confusing. You will find both items plugged.

How many miles are on the car?

[nyko46]

Originally Posted by engatwork

No, he is calling it the name MB put on it. When I was trying to help customer I found their naming quite confusing. You will find both items plugged.

How many miles are on the car?

120150 Miles and I drive it 54 miles highway every day.
Which one is easier to clean, the first or the second one?
The first one I just replaced fora new one.

[jay_bob]

Pull the triangle resonance pod off (3 bolts, pull up) to get a lot better view of the back of the mixing chamber.

[engatwork]

Drop what MB calls the DPF where exhaust is opened up, reset code and take it around the block.

[ROLLGUY]

Originally Posted by jay_bob

Pull the triangle resonance pod off (3 bolts, pull up) to get a lot better view of the back of the mixing chamber.

I did just that, and no sensor in the back of the mixing chamber. There has to be something else leaking boost.

[ROLLGUY]

Quote:
Originally Posted by jay_bob
Pull the triangle resonance pod off (3 bolts, pull up) to get a lot better view of the back of the mixing chamber.

Originally Posted by ROLLGUY

I did just that, and no sensor in the back of the mixing chamber. There has to be something else leaking boost.

I had another look at this today. I removed the snap ring from the turbo actuator so I could manually give it boost while a friend revved up the engine. Sure enough, there was a huge boost leak around the boost hose connection to the mixing chamber. I removed the air intake hose to get a better look, and you guessed it- the temp sensor was behind dangling by the wire. I plugged it back in, and now the car drives like a greased cheetah chasing a bullet train (well not quite, but close). Evidently this engine is a little different than the E class, in that the sensor is not inside the mixing chamber and can be seen by removing the resonance pod. It seems that I did not have to replace the boost sensor, or clean the DPF after all. Thanks jay_bob for leading me in the right direction.....Rich