CLK-Class (W209) 2003 on: CLK 270 CDI, CLK 200K, CLK 200 CGI, CLK 240, CLK 320, CLK 350, CLK 500, CLK 550 [Coupes & Cabriolets]

MAF Cleaning Help

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Old Nov 17, 2015 | 05:10 PM
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04 CLK 500
MAF Cleaning Help

So, I read a few guides already. I am still stuck removing the electrical connector from the MAF. I pressed the top and bottom taps and pulling and also using a little screw driver but worry it will damage the tabs. Still no luck. My fingers nails are in pain. How do you guys remove it?? with a bit of force? and screw driver help?
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Old Nov 17, 2015 | 05:16 PM
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It may be different on different W209 versions, so that info would be helpful to someone who has removed theirs.

I have never removed mine (550). I clean it about once a year using MAF by just spraying it through the intake mesh cover.
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Old Nov 17, 2015 | 07:13 PM
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I bought the cleaner spray. Isn't is bad to just spray without removing it?? I watched a few YouTube videos and they show a lot of residue/deposit drip out from the MAF. Maybe different for the 550 models. Mine is 500.

Last edited by EMC; Nov 17, 2015 at 07:18 PM.
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Old Nov 17, 2015 | 09:11 PM
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Yeah, I took one look at that clip and knew it would break. So I sprayed mine in place. I waited a while for it to evaporate, started the car and it blew smoke and the dash lit up like a Christmas tree. Shut it off after a minute and restarted and it was good as new.
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Old Nov 17, 2015 | 10:23 PM
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04 CLK 500
CRC mass flow cleaner? My engine light is on. Should I replace it? And don't bother spraying?
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Old Nov 17, 2015 | 10:37 PM
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What do you mean your engine light is on? A hundred things can do that. What code is it?
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Old Nov 17, 2015 | 10:43 PM
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04 CLK 500
P0101 Mass or volume air flow circuit range/performance
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Old Nov 18, 2015 | 01:31 AM
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Originally Posted by EMC
CRC mass flow cleaner? My engine light is on. Should I replace it? And don't bother spraying?
I used CRC MAF cleaner.

I would certainly spray clean it before replacing it.
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Old Dec 4, 2015 | 09:58 PM
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Ok, I just replaced the MAF today myself. After starting the car a few times the engine light disappeared. I noticed a little burning smell coming from under the hood? is it cause of the cold weather? normal? And a whistling sound that is constant not loud very light on the driver side, I believe it is coming from underneath the hood. but the good news is my catalytic converter stopped making the marble sounds today. I think the sound will come back again soon. Any suggestions of an aftermarket catalytic converter? I wish I can delete it but it is illegal from where I am from and won't pass emissions.

Last edited by EMC; Dec 5, 2015 at 12:16 AM.
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Old Dec 5, 2015 | 11:28 AM
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Burning smell and whistling sound is likely a bad cat.
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Old Dec 5, 2015 | 01:44 PM
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The burning smell seems to be coming from the top vents from the hood. I tried sniffing where the front grille and couldn't really smell anything. The smell is very light.
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