Not a good day...p0300 - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 08-05-2013
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Not a good day...p0300

My car CEL shows p0300,p0301,p0302,p0303. So, misfires on cyl.1,2,3. I started reading a lot of the possible fixes but was curious if anyone has had a catalytic converter fail and cause misfires. I am thinking cat first since I have one side misfires.

Thanks and any suggestions would be good.

Car is a 03 Slk 320
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#2 Old 08-05-2013
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Well crapspackle! hopefully the 170 experts will chime in soon Mike!


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#3 Old 08-05-2013
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Hope so.
I am not sure if backpressure from a plugged or failed cat could cause misfires on the whole side.. But find it odd to have misfires on three cylinders.
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#4 Old 08-05-2013
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Tolak? J? Beuller? help this man out please


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#5 Old 08-06-2013
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Bumping.. although I'm afraid there is so much going on with the fault codes that you may just have to suck it up and take it in for an estimate of everything.


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#6 Old 07-21-2014
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p0300 code fixed.

This was an old post. However thought I would follow up with the fix. It was the Drivers side front cat causing problems. It had broken up and the pieces were trapped in the screen to the back driver side cat. This caused a blockage that made the all three cylinders on that side misfire. On a side note the passenger rear cat was also bad. However that one may have been gone for awhile since it was completely hollow and no pieces were left. I was thrilled to find an aftermarket part for less than $300. So, I replaced 3 of the 4 cats.
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#7 Old 07-21-2014
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Thanks for the update. I can't say how frustrating it is to follow a link from google and find it unresolved. Good looking out.
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#8 Old 07-22-2014
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Agreed, a thread without an ending is a bit like reading a good book with the last page missing. Thanks for the update.
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