2011 C300 4matic sport
#1
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Hi all, I need help. My C300 just started misfiring one morning. I had replaced the spark plugs about 6 months ago. The codes that were present were 0912, 1360, 2093, 2353, 0645, 0780, 0653 and 0629. I checked the current data and it was showing only cylinder #4 misfiring. So I replaced the coil and cleared the codes. I started the car and it ran good for a few minutes and then started to misfire again. This time the codes were 0600, 0632, 0640, 0648 and 0656. I was told to replace the rest of the coils and it should fix the issue. So I replaced the rest of the coils and cleared the codes again. The car started and ran great for about an hour and a half (about 30-40 miles) and then it started to misfire badly. I now have codes 0600, 0912, 0629, 0637, 0645, 0653 and 0563. The car only has 78k on it.. I filled it with 93 octane fuel, the alternator is charging at 14.5v, the battery is less than 1 year old and the car hadn't had any issues up until it started misfiring that morning. Please help.
#2
Super Member
Check this MB Forum link where I was one of the posters..sounds a lot your problem, doesn't it.
https://mbworld.org/forums/c-class-w...dtc-codes.html
https://mbworld.org/forums/c-class-w...dtc-codes.html
#4
Super Member
If you are a DIYer you can go through these checks. Values are for a Subie but probably the same for any sensor make. Can't paste YouTube link but a Google Search of "check cam/crank sensor " will get you there.
Last edited by gamma300C; 01-31-2021 at 11:02 AM.
#6
Super Member
The company line is that an intermittent cam sensor timing error can set off misfire codes but necessarily a P0340 code. This tends to be thrown when the sensor has failed...the car can be hard pressed to start or run when this happens. I believe an intermittent crank sensor will more often set off its specific code with car showing similar Sx's of poor idle, rough rev'ing, power down.