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Code P0306

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Old 02-08-2008, 05:12 PM
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1999 C280 Sport
Unhappy Code P0306

What could be the cause of this code. Is it always something to do with #6 cylinder or is it a code that could mean numerous things. So far I've done, the plugs,the injectors,fuel filter. An checked all the hoses. Tomorrow I am going to try the plug wires. Please advise if you have had simular problems and have found a cure. Could the MAF be the culprit here? I've been reading a lot lately that the MAF can be a culprit. Whe I am in park and rev the engine it cuts out and speeds up. This is driving me nuts Thanks

Last edited by 99MBSport; 02-08-2008 at 06:42 PM. Reason: add material
Old 02-08-2008, 06:47 PM
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209/W210 Estate /W211 modded by MBENZNL
Originally Posted by 99MBSport
What could be the cause of this code. Is it always something to do with #6 cylinder or is it a code that could mean numerous things. So far I've done, the plugs,the injectors,fuel filter. An checked all the hoses. Tomorrow I am going to try the plug wires. Please advise if you have had simular problems and have found a cure. Could the MAF be the culprit here? I've been reading a lot lately that the MAF can be a culprit. Whe I am in park and rev the engine it cuts out and speeds up. This is driving me nuts Thanks

The P0306 is # 6 Miss fire..I Would swap plug wires and or test them with a OHM Meter to check resistance in the wire and connectors

While in N or P the Engine WILL Cut out at 2/2.5 K RPM...as the ME control unit does NOT detect the car is in gear

Last edited by MARK CUMMINS; 02-08-2008 at 06:54 PM.
Old 02-09-2008, 07:32 PM
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I replaced the wires on Cylinder 5 and 6 and 4 plugs. Switched coils from 6 to 5 and gave the MAF a smack. Car started and is running PURRRRRfect.
Old 09-22-2009, 02:21 AM
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2007 C230 Sports ,Old 1997 C280
I know this is an old thread,but did you ever have any miss fire issues with cylinder 6?

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