Mass Air Flow Sensors - 6.2 liter engines - Mercedes-Benz Forum
 
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post #1 of 2 (permalink) Old 01-09-2019, 05:48 AM Thread Starter
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Vehicle: 2008 AMG CLK63 Conv., 2012 R350 4-Matic, Wife's 2015 C300 sedan
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Mass Air Flow Sensors - 6.2 liter engines

I think this issue applies to all of the 6.2 V-8 naturally aspirated 156 series engines, certainly the CLK, C, and possibly CL, CLS, E, ML, S and SL AMGs using this engine.

One (for sure) or both (probably and while I'm at it anyway) of the MAFSs need replacing on my CLK63, a consequence of the flooding nearly three years ago, no doubt. The left (driver side) engine bank took in a big gulp of water, hydro-locked one or more cylinders, and in the process I think the MAFS got hit with a big skoosh of water which would probably have knackered it if it hasn't just died of old age (105K miles on it).

As standard, each MAFS is embedded in the top air filter cover for the cylinder bank it serves. The air filter cover is an expensive to make die-cast aluminum piece. The cost of the MAFS plus casting is $312 list, $250 ish on line, so a pair is going to set me back $500 ish. No labor as I'll do the work myself.

I was looking at the thing the other day and I realized the sensor itself seems to be just held in place in the casting by a couple of clips. It doesn't seem unreasonable, therefore, just to replace the sensor, and to re-use the casting. I'm sure a screwdriver would prise the clips off, then the sensor could be swapped and the clips put back on (using a G-clamp for brute force if needed), maybe a hidden o-ring or just a smear of instant gasket needed to seal.

SO....

Has anyone tried this and succeeded? If so what part no. for the sensor?

If no-one has done this I'm going to give it a go. I mean, what do I have to lose, right?

I'm sure it's just a Bosch or similar standard sensor really....
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post #2 of 2 (permalink) Old 03-02-2019, 12:53 PM Thread Starter
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So I found a pair of used MAFs from a C63 (same part numbers as my CLK63) on Hawaii. $125 plus shipping. Since the list price of a new pair is over $600 and as the seller lives on Hawaii (nowhere to rack up really high miles) I figured they were worth a punt.

Fitted them today and haven't tried them out yet.

BUT to answer my own question here is a MAF sensor pulled out of one of the old ones.

It's a Bosch. Part numbers are 0 280 218 185 or A 156 090 00 48.
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Last edited by IWantedaJag; 03-02-2019 at 06:32 PM.
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