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  #1  
Old 05-03-2006, 03:27 PM
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W202 Ignition coil question - P0302

I recently had my codes read and I have 2 codes, P0300 and P0302. Which as I understand it the # 2 coil. I checked the connections and wiring harness, so I think it may really be # 2 coil - but which of the two coils is # 2? The one on spark plug #2 or the one on spark plug # 4? I read early from a Gilly reply that P0302 is for cylinder 2 and P0301 is cylinder 1, but given this four banger only has two coils. It appears that the number # 2 coil is for cyclinders 1 and 4, and therefore this coil is the one mounted atop of #4 spark plug. Some help would be much appreciated.

Please help.

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  #2  
Old 05-03-2006, 03:28 PM
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SOrry this is for my '98 C230

My fault, of course most would have figured it out I think since two of mine are four bangers.
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  #3  
Old 05-03-2006, 07:43 PM
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Most people will tell you to move the suspected coil, to fire the OTHER TWO cylinders.
If the misfire code moves with the coil, it would verify your suspicion ( defective coil ).
Have you looked at these ? ( Coil connectors ):
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1R510G7PR1SL168HQF&year=1998&make=MB&model=C-230-001&category=F&part=Spark+Plug+Connector
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  #4  
Old 05-03-2006, 07:56 PM
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Thanks Manny

I have inspected the plug holders and they seem fine. I appreciate your help but I do not have the OBD reader here, so I need to figure it out. It seems like a simple question - but I have the Haynes manual and a MB Service manual which have not helped. Actually the MB Service manual indicates that the ignition coil # 2 is for cylinders 2 and 3 - so unless someone else can confirm tonight I will replace the first coil from the front of the engine, which implies cyclinders 2 and 3.
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  #5  
Old 05-03-2006, 08:32 PM
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If you look in your Haynes manual ( Section 5B-3 ), you will see the first coil fires # 1 & 4 cylinder, the second coil fires # 2 & 3.
That would make you correct in your assumption.
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  #6  
Old 05-03-2006, 09:13 PM
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Umm, I must have missed that.

I just changed the plugs out even though they were less than 20K mile on them, and I changed out the # 2 & # 3 cylinder coil. Test drove it, started and stopped several times and it seems to have solved the problem. I also had inspected the wiring harness, etc - it seemed to be the coil so I changed it.
Another MB issue solved! Thanks for this forum!

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