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I have a 1999 SLK230 that I bought in 2001. It's been a great car that I love driving. Over the years it has needed some work and your forum has been a great source of information. I love the fact that there are lots of people out there working on these cars!

My latest issue has to do with the K40 relay. I pulled it out once already and re-soldered the typical part on the board that is troublesome. Last week I had codes dealing with a misfire on the #3 and a MAF code. I cleaned the MAF. Read the error codes again, still had a misfire 3 and now the P1235 (k40 relay) code. I just replaced the coil packs, not the spark plugs, and still have the P1235 error.

Would replacing the spark plugs have any effect on the P1235 code? Or should I just bite the bullet and replace the relay?

Thanks,
KMD
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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98,482 Posts
Welcome to SLKWorld.com: The #1 Mercedes-Benz SLK Forum from Florida!

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Thank you
Jeff
Moderator/Founding Member/Ride of the Month Coordinator
 

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Administrator 2009 SLK 55 AMG/Founding Member 2006
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98,482 Posts
how old is the crank position sensor cps? How many miles do you have?
Don't just keep replacing parts
if code is misfire 3
move coil pack to 4, move spark plug to 2 and ignition wire to 1
clear code and see what it says next time
if you still have misfire 3, try to then move injector out of cylinder 3
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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14,296 Posts
Welcome from Canada :grin:
 

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Super Moderator 2006 SLK 280
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11,319 Posts
Welcome to SLKWorld.com from Northern California
:burnout::Beer:
 

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Super Moderator UK SLK 55 AMG 2007
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28,785 Posts
Hi Karina,
Welcome from Wirral, England.


We have a free to enter monthly competition.
Entry is open from the 1st to the 15th of every month. You simply post a reply with 3 photos.
After the 15th we usually open a poll for members to vote on their favourite.
Here's the main thread:
ROTM Submissions & Voting - Mercedes Benz SLK Forum


This month's entries:
http://www.slkworld.com/rotm-submissions-voting/412769-february-2017-slkworld-com-ride-month-competition.html

The covers almost everything link:
http://www.slkworld.com/general-discussion/354330-links-toparts-assemblies-technical-data-locations-parts-slks.html

There's a R170 diy link in my signature below.

Regional threads for meets/local info:
U.S. Southwest Region - Mercedes Benz SLK Forum

Good luck fixing the codes.
 

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Premium Member 2008 SLK55 AMG "Mabel"
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15,394 Posts
Hi, welcome from Barrhead, Scotland. :smile:
 

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Premium Member 2009 SLK55 AMG
Joined
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12,258 Posts
Welcome from the Sacramento Valley SLK Enthusiasts!
 

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Premium Member 2005 SLK55 AMG
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11,406 Posts
Hi and welcome to SLKWorld.com from the UK Midlands - Thanks for joining us and posting an intro! :)
 
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