DIY: MAF Mass Airflow Sensor removal and cleaning 2004 E320
Thread Starter
Member
Joined: Jan 2012
Posts: 244
Likes: 4
From: PA, USA
2004 E320 4matic Sedan
DIY: MAF Mass Airflow Sensor removal and cleaning 2004 E320
Attached is a PDF I have made showing how to remove, clean, and replace the MAF on a 2004 Model Year E320 V6. It is not difficult to do.
Thread Starter
Member
Joined: Jan 2012
Posts: 244
Likes: 4
From: PA, USA
2004 E320 4matic Sedan
I cleaned the MAF because....
I changed the plugs and air filters and got lean DTC codes afterwards on both banks. There is no misfiring.
So I decided I'd better clean everything up that may effect air and fuel measurement before I worry too much and maybe the codes will go away.
I have since heard on this forum that it is not unusual for the car to need to go through a mixture adaptation cycle after getting new filters. It needs to "understand" the associated improvement in airflow.
But I don't know how to make it do that re-adaptation and after 10 days it still hasn't by itself. I don't have Startac in my toolbox.
So I still have the lean DTCs on both banks and a check engine light. The codes are easy to clear with my reader, but I can't get them to go away and stay away. I do not believe I have any bad parts in the picture. The car is actually running pretty well, with maybe a slowness to change up a gear on a steady throttle.
So I decided I'd better clean everything up that may effect air and fuel measurement before I worry too much and maybe the codes will go away.
I have since heard on this forum that it is not unusual for the car to need to go through a mixture adaptation cycle after getting new filters. It needs to "understand" the associated improvement in airflow.
But I don't know how to make it do that re-adaptation and after 10 days it still hasn't by itself. I don't have Startac in my toolbox.
So I still have the lean DTCs on both banks and a check engine light. The codes are easy to clear with my reader, but I can't get them to go away and stay away. I do not believe I have any bad parts in the picture. The car is actually running pretty well, with maybe a slowness to change up a gear on a steady throttle.
Newbie
Joined: Apr 2013
Posts: 1
Likes: 0
04 clk500
removing MAS on 04 CLK 500
Good information on removing the MAS. I used this as a templete to remove an clean the MAS on my 04 CLK 500. The only exception was that it was easier to remove the MAS and then disconnect the elec plug. There was no clearance to disconnect it first.
Newbie
Joined: Sep 2012
Posts: 3
Likes: 0
e320
MAF Plastic Collar
I had to replace my Crankcase Breather Hoses after replacing my valve cover gaskets. This DIY was just what I needed to understand how to remove the MAF Plastic Collar and the MAF (AKA A1120940048 Air Mass Sensor).
I replaced the following breather hoses:
- I left the electrical connectors on.
- I Used a screwdriver to lever apart the clip to get one part of the clip passed the other. The collar then needs to be opened up quite a lot and removed.
I replaced the following breather hoses:
- 1120180482OE at Valve Cover
- 1120180282OE Center Portion
- 1120180182OE Lower Portion
- 1120180382OE Upper Portion
Last edited by wclopton; Jul 24, 2014 at 03:56 PM.
Member
Joined: Jan 2007
Posts: 134
Likes: 3
From: west palm beach USA
E320 2004 model Silver sedan
i don't have a problem with my car but should i go ahead and clean it anyways? and what is a MAF spray? in your writeup you said only to use a MAF spray? where do i get it from?
MBWorld Fanatic!
Joined: Jul 2006
Posts: 1,779
Likes: 11
From: Long Island, NY
2004 E320
He hasn't been online in 9 months, so don't expect an answer any time soon. He does mention in the pdf that he used CRC brand. Check with an auto parts store if they carry a MAF spray.
A quick Google search shows that it is available : http://www.fcpeuro.com/products/air-...FWho7AodjFMAOQ
He never did follow up and state whether or not he was able to get rid of the codes permanently.
A quick Google search shows that it is available : http://www.fcpeuro.com/products/air-...FWho7AodjFMAOQ
He never did follow up and state whether or not he was able to get rid of the codes permanently.
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Thread Starter
Member
Joined: Jan 2012
Posts: 244
Likes: 4
From: PA, USA
2004 E320 4matic Sedan
Better late than never
For those who have nothing better to do than wonder if I ever got rid of the two DTC codes (that led me to write this DIY in the first place). Yes, I had dislodged a vacuum hose near the front left headlight when I was changing the sparkplugs. I noticed it about a month later and fixed it in seconds, cleared the codes and all was soon fine again.
If you have been waiting for this news for three years, you really need to get out more!
Sadly, my E320 4Matic is now no more. The front universal joint on the driveshaft going forward from the transfer case had a catastrophic failure, took out multiple parts, destroying the transfer case and other things under the hood. It was not economically repairable and is now a parts car at my indie. Happily, I replaced it with an S550 4Matic on Friday. So now I have something to really worry about.)
Happy MAFing.
If you have been waiting for this news for three years, you really need to get out more!
Sadly, my E320 4Matic is now no more. The front universal joint on the driveshaft going forward from the transfer case had a catastrophic failure, took out multiple parts, destroying the transfer case and other things under the hood. It was not economically repairable and is now a parts car at my indie. Happily, I replaced it with an S550 4Matic on Friday. So now I have something to really worry about.)
Happy MAFing.
Junior Member
Joined: Dec 2020
Posts: 46
Likes: 3
E320
Do I have to remove?
IF I WANT TO CLEAN THE MAF cant I just spray in to it with it still installed? As long as I unplug the sensor why do I have to remove it to clean it?
Junior Member
Joined: Dec 2020
Posts: 46
Likes: 3
E320
For those who have nothing better to do than wonder if I ever got rid of the two DTC codes (that led me to write this DIY in the first place). Yes, I had dislodged a vacuum hose near the front left headlight when I was changing the sparkplugs. I noticed it about a month later and fixed it in seconds, cleared the codes and all was soon fine again.
If you have been waiting for this news for three years, you really need to get out more!
Sadly, my E320 4Matic is now no more. The front universal joint on the driveshaft going forward from the transfer case had a catastrophic failure, took out multiple parts, destroying the transfer case and other things under the hood. It was not economically repairable and is now a parts car at my indie. Happily, I replaced it with an S550 4Matic on Friday. So now I have something to really worry about.)
Happy MAFing.
If you have been waiting for this news for three years, you really need to get out more!
Sadly, my E320 4Matic is now no more. The front universal joint on the driveshaft going forward from the transfer case had a catastrophic failure, took out multiple parts, destroying the transfer case and other things under the hood. It was not economically repairable and is now a parts car at my indie. Happily, I replaced it with an S550 4Matic on Friday. So now I have something to really worry about.)
Happy MAFing.
Newbie
Joined: Dec 2020
Posts: 3
Likes: 0
From: North Carolina
E320
PDF MAF File
