Check Engine Light On - Mercedes Benz SLK Forum
SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

 
LinkBack Thread Tools
#1 Old 07-28-2010
SLK World Junior Member
 
Join Date: Jul 2010
Location: West Virginia
Vehicle: 2001 SLK 320
Other Toys: Impala SS,
Posts: 8
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
(Thread Starter)
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?
MountaineerSLK is offline  
Sponsored Links
Advertisement
 
#2 Old 07-29-2010
Administrator
 
Livefreeordie's Avatar
 
Join Date: Oct 2007
Location: Rochester,NH USA
Vehicle: 2002 SLK230K 1986 560SL 2012 VW Tiguan
Posts: 9,561
Country:
Chats: 27
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Thanks: 677
Thanked 940 Times in 811 Posts
Garage
You can get some MAF cleaned at any auto parts store its made by CRC.
Livefreeordie is offline  
#3 Old 07-29-2010
SLK World Member
 
Join Date: May 2008
Location: ARLINGTON, TEXAS
Vehicle: 2001 SLK320 IRRIDIUM/CHARCOAL
Other Toys: 2003 HONDA VTX1300 RETRO
Posts: 10
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 1
Thanked 0 Times in 0 Posts
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
RQUICK1 is offline  
#4 Old 07-29-2010
Administrator
 
Livefreeordie's Avatar
 
Join Date: Oct 2007
Location: Rochester,NH USA
Vehicle: 2002 SLK230K 1986 560SL 2012 VW Tiguan
Posts: 9,561
Country:
Chats: 27
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Thanks: 677
Thanked 940 Times in 811 Posts
Garage
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.
Livefreeordie is offline  
#5 Old 07-30-2010
Elite SLK World Member
 
Join Date: Feb 2010
Location: Santa Monica CA
Vehicle: Black 2002 SLK AMG
Other Toys: Red 1965 Mustang convertible 4bbl V-8, 4spd
Posts: 843
Country:
Chats: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 221
Thanked 215 Times in 141 Posts
Garage
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) )
Santamonica SLK32 is offline  
#6 Old 09-07-2010
SLK World
 
Join Date: Nov 2009
Location: Nashville, Tennessee
Vehicle: 2001 SLK 320 Sport
Posts: 16
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 5
Thanked 0 Times in 0 Posts
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.
Big Dog is offline  
#7 Old 10-09-2010
SLK World
 
Join Date: Nov 2009
Location: Nashville, Tennessee
Vehicle: 2001 SLK 320 Sport
Posts: 16
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 5
Thanked 0 Times in 0 Posts
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?
Big Dog is offline  
#8 Old 10-09-2010
Elite SLK World Member
 
Join Date: Nov 2009
Location: Lebanon
Vehicle: 2001 Silver SLK230
Other Toys: 1991 Toyota 4Runner
Posts: 525
Country:
Chats: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 111
Thanked 104 Times in 78 Posts
Garage
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.
GusSLK is offline  
#9 Old 10-09-2010
Administrator
 
Livefreeordie's Avatar
 
Join Date: Oct 2007
Location: Rochester,NH USA
Vehicle: 2002 SLK230K 1986 560SL 2012 VW Tiguan
Posts: 9,561
Country:
Chats: 27
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Thanks: 677
Thanked 940 Times in 811 Posts
Garage
PDF file for the air cleaner.
Attached Files
File Type: pdf Replacing SLK320 Engine Air cleaners.pdf (620.6 KB, 151 views)
Livefreeordie is offline  
The Following User Says Thank You to Livefreeordie For This Useful Post:
#10 Old 10-12-2010
SLK World
 
Join Date: Nov 2009
Location: Nashville, Tennessee
Vehicle: 2001 SLK 320 Sport
Posts: 16
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 5
Thanked 0 Times in 0 Posts
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!
Big Dog is offline  
#11 Old 10-13-2010
SLK World
 
V6SLK's Avatar
 
Join Date: Jul 2009
Location: Santa Maria, California
Vehicle: 2003 SLK 320 Magma Red
Other Toys: Honda Valkyrie motorcycle
Posts: 82
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 18
Thanked 12 Times in 8 Posts
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
V6SLK is offline  
#12 Old 10-13-2010
Elite SLK World Member
 
Join Date: Oct 2009
Location: Albuquerque, NM, USA
Vehicle: 2006 SLK 350 Designo (sold)
Other Toys: 2007 GL320CDI
Posts: 1,139
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 1
Thanked 247 Times in 175 Posts
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.
lkchris is offline  
#13 Old 10-14-2010
SLK World
 
V6SLK's Avatar
 
Join Date: Jul 2009
Location: Santa Maria, California
Vehicle: 2003 SLK 320 Magma Red
Other Toys: Honda Valkyrie motorcycle
Posts: 82
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 18
Thanked 12 Times in 8 Posts
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.
V6SLK is offline  
Sponsored Links
Advertisement
 
Reply

  Lower Navigation
Go Back   Mercedes Benz SLK Forum > Mercedes Benz R170 SLK Class Cars > SLK R170 General Discussion

Bookmarks

Quick Reply
Message:
Options
Upload your files to MEGAUPLOAD
Upload your images to ImageShack

Register Now

In order to be able to post messages on the Mercedes Benz SLK Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Check Engine Light ON HwoALanG SLK R171 General Discussion 21 04-16-2012 09:34 PM
OBDII connection and check engine light Westiemom Ask DansSLK 10 08-01-2010 12:53 PM
E 430 Amg dltslk Mercedes Benz Posers 4 04-02-2008 11:36 AM
Check Engine Light x2! jbanks15 SLK R171 General Discussion 4 05-26-2007 08:05 PM
Check engine light bclark Ask DansSLK 8 01-16-2007 01:37 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome