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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > Diy - Maf Sensor Cleaning



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Diy - Maf Sensor Cleaning
Published by FrankiE90
02-17-2011
Diy - Maf Sensor Cleaning

MAF cleaning on N55 with pictures
can be with any MAF Sensor on bimmer too ( N52 MAF )


Tools:
- torx screw (torx25)
- flat head screw driver

and a bottle of
Mass Air Flow Cleaner



Install time: 15-45min

pretty easy DIY but
BECAREFUL of the sensor - this part is expensive.
*Like any DIY this is at ur own risk members.


FIG 1: Pop those clips off the intake box
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FIG 2: different angle, pop em off there are 4 clips.
then lift the lid high and pull off - put a little muscle into it.
u'll see how the back of lid locks on - just remeber that when
putting back on.
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FIG 3: you want to use a mini flat head screw driver,
pull the sensor plug out. then lift the intake lid and
unscrew the 2 bolts with torx wrench.
THEN CAREFULLY wiggle off the MAF sensor - and pull it
out. DONT TOUCH the electronic insides only spray it.
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FIG 4: Spray the electronics
shake off any excess juice - let it air dry.
takes a few seconds.
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FIG 5: 4-10hp
if u chit is dirty it'll make a big difference.
they say clean the MAF sensor every time u change the
air filter.
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FIG 6:
check to make sure the sensor is dry.
then put it all back.
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congrats ur MAF Sensor is clean.
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  #1  
By PaulBailey@ltbmw on 02-17-2011, 05:39 PM
Great work!!!
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  #2  
By Neutrino45 on 02-17-2011, 06:39 PM
Does cleaning it make your car idle/drive smoother, increase performance, or?
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  #3  
By FrankiE90 on 02-17-2011, 07:13 PM
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Dirty Maf equals inaccurate reading of air,
results in poor gas mileage and performance.

clean'n will optimize the sensor -
any built up residue would be gone.
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  #4  
By Blindrage606 on 02-17-2011, 11:17 PM
Because of the cost of new MAF, this DIY is not worth the risk/time.

Relates back to the old quote, "If it's not broken, fix it 'till it is."
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  #5  
By e92LuNaTiC on 09-28-2011, 11:23 PM
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Thanks Frankie! Just did this right now, looking forward to seeing how the car responds tomorrow! A bit lazy right now to test it out LoL!
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  #6  
By ashleymarie0792 on 02-15-2012, 03:16 PM
where is the n54 maf sensor lol 335i 2007
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  #7  
By Cuba on 02-15-2012, 03:41 PM
i had a service engine light and and i read the error. it said something was too rich. I have an AFe intake, i cleaned the MAF sensor hoping the light would go away but it didn't. any ideas on how to fix this?
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  #8  
By raybenz2011 on 04-13-2012, 09:49 PM
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Warning I'm Not A Bmw Mechanic!

Quote:
Originally Posted by Cuba View Post
i had a service engine light and and i read the error. it said something was too rich. I have an AFe intake, i cleaned the MAF sensor hoping the light would go away but it didn't. any ideas on how to fix this?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BUT! i DABBLE WITH MY CAR! HEHEHE I THOUGHT FOR A SECOND THEN ABOUT A MINUTE YUP AN HOUR PAST AFTER I CHECKED OUT THE MOST AWESOME DIY (WITH PICS) OF CLEANING WITH C R C MASS AIR FLOW CLEANER -- THE MASS AIR FLOW SENSOR -- WHICH HAPPENS TO BE LOCATED BY THE BUTTERFLY VALVE IN THE THROTTLE BODY USING THE SAME CLEANER WEE HOOO! WE HAVE LIFT OFF NASA REMOVE THE PLASTIC TUBA WITH YOU'RE BMW FLATHEAD SCREWDRIVER TOOL VOILA! SPRAY THE INSIDE OF THE THROTTLE BODY NOT TO FLOOD YOU'RE BMW ENGINE AND OPEN YOU'RE BUTTERFLY VALVE AS TO WIPE INSIDE AND PRESTO! YOU'RE ERROR MESSAGE IN A FEW DRIVES MIGHT(I STRESS MAYBE!) WILL DISAPPEAR HOPE THIS HELPS
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  #9  
By Cuba on 04-28-2012, 07:38 PM
after about a week and a half of driving it went away. been gone for about 2.5 months now. love seeing a dash with no service engine light
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  #10  
By TroyDeJ on 04-29-2012, 12:52 AM
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Quote:
Originally Posted by Blindrage606 View Post
Because of the cost of new MAF, this DIY is not worth the risk/time.

Relates back to the old quote, "If it's not broken, fix it 'till it is."
unless you have trouble tying your own shoes this is not a difficult DIY at all
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  #11  
By jimminyjamez on 05-11-2012, 01:43 PM
Awesome post. Thanks!
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  #12  
By kiwi29 on 05-13-2012, 05:21 PM
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how often should the MAF be cleaned?
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  #13  
By kjang on 05-13-2012, 08:07 PM
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Quote:
Originally Posted by kiwi29 View Post
how often should the MAF be cleaned?
Unless there is a problem, never. As stated above, if there are no problems, don't go looking for them.
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  #14  
By kiwi29 on 05-14-2012, 01:47 AM
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Quote:
Originally Posted by kjang View Post
Unless there is a problem, never. As stated above, if there are no problems, don't go looking for them.
But how would you know if you need to clean it? I recently replaced my intake filter and its already dirty as hell! Should I clean it when I clean my filter?
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  #15  
By 1QuikWS6 on 05-15-2012, 02:40 AM
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Most times this will become an issue is with oiled filter elements and a user that doesn't know how to properly re-oil the element, resulting is an oil soaked filter that transfers the oil to the MAF.

I typically clean mine 1X/year regardless using the CRC in all my cars. Been doing it since the year 2000 & haven't ruined a MAF sensor yet

CRC MAF Cleaner is only product that should be used - do not use any other type of solvents, or alcohol, as they leave a residue of their own on the MAF wire in the process of drying, & NEVER actually touch the MAF wire with anything such as cloth, fingers, etc.

Same idea as Electrical Contact Cleaner that has been used in industry since forever - cleans electrical items without actual physical contact & leaves no harmful residue.
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  #16  
By charles.soori on 05-20-2012, 09:29 AM
Just did this on my gf benz c class as it was throwing fuel trim bank 1 and bank 2 gave it a nice spray and no more errors saved 400$ for the new part. Mite clean my e90 next weekend.
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  #17  
By Ali-323i on 08-07-2013, 12:32 PM
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Quote:
Originally Posted by raybenz2011 View Post
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
BUT! i DABBLE WITH MY CAR! HEHEHE I THOUGHT FOR A SECOND THEN ABOUT A MINUTE YUP AN HOUR PAST AFTER I CHECKED OUT THE MOST AWESOME DIY (WITH PICS) OF CLEANING WITH C R C MASS AIR FLOW CLEANER -- THE MASS AIR FLOW SENSOR -- WHICH HAPPENS TO BE LOCATED BY THE BUTTERFLY VALVE IN THE THROTTLE BODY USING THE SAME CLEANER WEE HOOO! WE HAVE LIFT OFF NASA REMOVE THE PLASTIC TUBA WITH YOU'RE BMW FLATHEAD SCREWDRIVER TOOL VOILA! SPRAY THE INSIDE OF THE THROTTLE BODY NOT TO FLOOD YOU'RE BMW ENGINE AND OPEN YOU'RE BUTTERFLY VALVE AS TO WIPE INSIDE AND PRESTO! YOU'RE ERROR MESSAGE IN A FEW DRIVES MIGHT(I STRESS MAYBE!) WILL DISAPPEAR HOPE THIS HELPS
I don't think I understand this... can someone paraphrase? I also have a check engine light, possibly from my air intake, so will go and clean my MAF, but I think this post suggests cleaning something else too.

Any help?
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  #18  
By lokelo on 08-08-2013, 05:00 AM
Thanks - very helpful! Will try today
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  #19  
By 94marcus on 08-15-2014, 12:43 PM
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do you spray just that front part that the arrow points to or do you also spray the back part that has the two wires and little black liquid ball?
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  #20  
By GoRomeo on 08-15-2014, 12:47 PM
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Thanks for the DIY. I did this when I did my charcoal delete about 2 yrs ago. Easy job. Its always nice to see someone took the time to do it.
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  #21  
By mweisdorfer on 08-15-2014, 08:22 PM
You should only use CRC MAF cleaner.
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