After alost 2 month of doing research on tryint to find cheap way to fix heistation problem in my 2002 ML 320 i finaly got it fixed today. I drove already over 80 miles and car runs great.
I didnt want ot spend over 300usd for sensor so thats why tryied for this long. Was not easy becouse the OEM is different from what i got: OEM is whole pice ( Air Mass Flow Sensor with the elements around it ),thats why cost so much. All you need to do is replace just a sensor, but MB is not seling it.
Here is ebay item nr 130058996103 - with all description. Guy is selling it for 105.00 plus shipping cost.
I am not trying to help this guy sell hes item.I am trying to help everyone on this forum with this relly enoying problem on their cars.
I hope it will help.

Here are codes i was getting on it:
P0174
P0173
P0172
I also had missfire codes for 2nd,3rd,5th,6th cylinder

After i install the sensor, i had to reset the codes with the Code reader. The light didnt go out and the codes remain.I did it again and then i had to remove the key from egnition wait 5 sec and when i started the engine Check Engine Light went out.

Good luck everyone and Merry X-mas

_____________________________

1998 A6 2.8 Sport Pkg. - sold
2000 TT 1.8 T - sold
2002 C230K 42k miles
2002 ML320 68k miles

----- In US since Jun 2004 so still working on my English -----

What you bought is a VW part that dealers sell for $60 list! MANY people are selling that part for Mercedes.

A wholesale buyer can buy those parts for $40>

YES they will fit! NO they aren't for MB engines at all..

I have heard of MANY catalyst failures due to that part...

AS they say...let the BUYER beware!

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

I Have read your comments previosly about this item.And i really apprecciate your knowledge and all help.That was only one reason i didnt give a try with this part for alomost 2month. I didn't tryied to put vw part cuz like you said it woudln't work. I had contacted previos buyers who bought this item from this guy on ebay.
2 of them responded.One driving 1999 slk230 and one 2001 e320.They both confirmed that this part has been working good on theirs cars.
That's was the reason i tryied and so far i drove over 150miles is working great.
Compare to previos driving experience, now
car is very powerfull,tranny shifts smooth.
So far i am very happy.If i ll have any problem with it i will post a comment.
If this is same part as vw i overpaid, but 60$ is still much less then over 300usd for whosale MB.

You can get the real one here for $258.43 http://www.***************/search/product.aspx?sid=2tdw0oudwfqked55mahh5x45&makeid=800016@Mercedes&modelid=1387661@ML320&year=2002&cid=22@Fuel%20%26%20Air%20System&gid=5068@Air%20Mass%20Sensor with free shipping. My 2 cents.

I NEVER said it wouldn't work.
What I did say is that "BOSCH says" you will have long term problems as that sensor isn't designed for that application.
AND I do see many catalyst failures related to those cars running that sensor!
AS you pointed out it is ALL about $$$$$$. Some folks are making their share on those parts.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator