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Old 07-28-2010   #1 (permalink)
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Default Check Engine Light On

My CEL came on with an error code of P0175 which I find out is not a SLK code. It is a universal code for "right bank rich" I changed the air filters and the light went out. Drove it about 30 miles when it hesitated on accelleration and the light came back on. I checked and got the same code. Talked to a mechanic on line and he suggested a vacuum leak or the mass air flow sensor. I am wondering why the only code is for the right bank and nto another code for left bank. Could it be the O2 sensor?
My plans are to clean the MAF sendor and clear the code. Anyoner ever clean the sensor and with what?
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Old 07-29-2010   #2 (permalink)
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You can get some MAF cleaned at any auto parts store its made by CRC.
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Old 07-29-2010   #3 (permalink)
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This happened to my 2001 SLK 320. Same code. It was the mass air flow sensor. This is a common problem on the SLK 320's. You can buy a Bosh MAF on E-bay for $125
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Old 07-29-2010   #4 (permalink)
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You have to be careful with the ebay MAF there have been reports of them not working. If your going to buy a new one goto a good parts store or auto supply warehouse.
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Old 07-30-2010   #5 (permalink)
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The code can come from the MAF or from vacuum line links. Remember as our R170's age, the rubber in the vacuum lines ages too, and become hard and brittle. This makes the vacuum line prone to leaks from cracking or poor seals where the lines attach to the various fittings. Before you buy a new MAF, its worth taking a good look at the vacuum lines, since its s impler/less expensive fix.

from buellwinkle.com (a nice resource for SLK R170's):
P0170 Fuel Trim Malfunction (Bank 1) ) check vaccum leaks first or
P0171 System too Lean (Bank 1) ) faulty air mass flow sensor
P0172 System too Rich (Bank 1) )
P0173 Fuel Trim Malfunction (Bank 2) )
P0174 System too Lean (Bank 2) )
P0175 System too Rich (Bank 2) )
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Old 09-07-2010   #6 (permalink)
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My check engine light came on recently also. The mechanic told me the code was for a new MAF sensor and quoted me $650.00. After I regained consciousness, I started searching for one on the internet.

Almost all the sites I looked at showed 4 very different MAF sensors for a 2001 SLK 320 sport. There is an A1 Cardone MAF, Beck Arnley MAF (2 different kinds), Bosch MAF. How do I know which one to get for my vehicle and how difficult are they to replace?

Any suggestions on a reputable website to purchase this part?

Also, I figured I should go ahead and replace the air filter too. Is that a complicated task?

NOTE - I paid $850 to a Mercedes repair shop to replace my MAF on a 1997 C280 sport and learned afterwards I got ripped off big time. The part is supposedly very easy to replace. I vowed not to get taken like that a second time.
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Old 10-09-2010   #7 (permalink)
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Been a month and no response. I got a much greater amount of information on the benzworld.org forum.

Does anybody have information and illustrations for replacing and/or cleaning MAF on 2001 SLK 320? If not, how about some quick instructions on replacing the air filter and removing the engine cover?
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Old 10-09-2010   #8 (permalink)
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I came across more than one post talking about cleaning the MAF but I don't recall where they were. Try a search, and maybe create a new post. It would also help if you can get the fault code and post it here since you have doubts about your mechanic. Also, look for the crossfire manual on the forum, it's mechanically identical to the SLK320.
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Old 10-09-2010   #9 (permalink)
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PDF file for the air cleaner.
Attached Files
File Type: pdf Replacing SLK320 Engine Air cleaners.pdf (620.6 KB, 134 views)
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Old 10-12-2010   #10 (permalink)
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This .pdf file is excellent information for those unfamiliar with what's under the hood. I was able to locate and remove the MAF sensor and sprayed it down with the C&C MAF Sensor Cleaner. Now if I can just get it back on...

Thanks!
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Old 10-13-2010   #11 (permalink)
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Quote:
Originally Posted by Santamonica SLK32 View Post
The code can come from the MAF or from vacuum line links. Remember as our R170's age, the rubber in the vacuum lines ages too, and become hard and brittle. This makes the vacuum line prone to leaks from cracking or poor seals where the lines attach to the various fittings. Before you buy a new MAF, its worth taking a good look at the vacuum lines, since its s impler/less expensive fix.

from buellwinkle.com (a nice resource for SLK R170's):
P0170 Fuel Trim Malfunction (Bank 1) ) check vaccum leaks first or
P0171 System too Lean (Bank 1) ) faulty air mass flow sensor
P0172 System too Rich (Bank 1) )
P0173 Fuel Trim Malfunction (Bank 2) )
P0174 System too Lean (Bank 2) )
P0175 System too Rich (Bank 2) )
do you know what OBDII code reader buellwinkle is using? I need to purchase one and was considering the Equus 3130 with live data. Any thoughts would be appreciated.....thnx
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Old 10-13-2010   #12 (permalink)
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It's worth a try and it's cheap to attempt "cleaning" the MAF.

Chances are greater than 50-50 you'll still need a new one.

It's not only a "common problem" with the SLK320 but with EVERY Mercedes model fitted with this engine, i.e. M112. M113s, too.

Bad MAFs can create all kinds of codes, and "bad MAF" is seldom one of them.
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Old 10-14-2010   #13 (permalink)
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Quote:
Originally Posted by lkchris View Post
It's worth a try and it's cheap to attempt "cleaning" the MAF.

Chances are greater than 50-50 you'll still need a new one.

It's not only a "common problem" with the SLK320 but with EVERY Mercedes model fitted with this engine, i.e. M112. M113s, too.

Bad MAFs can create all kinds of codes, and "bad MAF" is seldom one of them.
I found that MAFS are failing due to over oiling the K&N Filters. The oil corrodes the sensing wires. If you follow the directions and properly oil the filters however this problem is minimized.
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