'07 CL600 - P0300 302 303
Thread Starter
Junior Member
Joined: Sep 2011
Posts: 37
Likes: 3
CL55
'07 CL600 - P0300 302 303 - UPDATE NOW MORE CODES
I wanted to thank all those who contribute to these forums, thanks to them I was able to repair my CL600 P0300 302/303 305/306 misfires.
I changed the right ( passenger ) side plugs with NGK Iridiums and due to the many posts here on the step by step to remove the coil rail, all went well.
The CL has 107K miles on the original plugs, so wayyyy over due and the plugs were wasted ( insulators on plugs themselves were cracking).
I also replaced the red insulators as many were hard and cracked.
I change the right side and took out for drive and with several WOT no issues, no more limp mode and no CEL.
One side took me 3 hours without rushing.
Next week Ill go after the drivers side.
I forgot how fast this car is....lightning.
UPDATE:
So the fun didnt last long and got another 301/302 error a day later. Any attempt to WOT puts car into limp mode.
So I worked with Clark a V12PACK and bought a passenger side / right side coil pack and replaced.
Test drove again WOT and now getting P312 02/06 | P311 01/06 | P300 03/06 | P311 Pd 04/06 | P312 Pd 05/06 |B3502 Pd 06/06
any ideas where to start???? would be appreciated
UPDATE LOL so a B3502 is rear window express up. Odd but not related to misfires. I can say after resetting the CELs the first WOT is sure a rush, car runs hard. Even accels hard enough to kick in traction control on the new tires and slams the sunroof shade open. Not to mention anything not tied down ends up in back seat. Then damn CELs come back
I changed the right ( passenger ) side plugs with NGK Iridiums and due to the many posts here on the step by step to remove the coil rail, all went well.
The CL has 107K miles on the original plugs, so wayyyy over due and the plugs were wasted ( insulators on plugs themselves were cracking).
I also replaced the red insulators as many were hard and cracked.
I change the right side and took out for drive and with several WOT no issues, no more limp mode and no CEL.
One side took me 3 hours without rushing.
Next week Ill go after the drivers side.
I forgot how fast this car is....lightning.
UPDATE:
So the fun didnt last long and got another 301/302 error a day later. Any attempt to WOT puts car into limp mode.
So I worked with Clark a V12PACK and bought a passenger side / right side coil pack and replaced.
Test drove again WOT and now getting P312 02/06 | P311 01/06 | P300 03/06 | P311 Pd 04/06 | P312 Pd 05/06 |B3502 Pd 06/06
any ideas where to start???? would be appreciated
UPDATE LOL so a B3502 is rear window express up. Odd but not related to misfires. I can say after resetting the CELs the first WOT is sure a rush, car runs hard. Even accels hard enough to kick in traction control on the new tires and slams the sunroof shade open. Not to mention anything not tied down ends up in back seat. Then damn CELs come back
Last edited by Titan1969; Apr 15, 2022 at 09:05 PM.
Member
Joined: Apr 2017
Posts: 134
Likes: 28
2014 ML350
Not sure if you've done it already but if not you may want to consider replacing the ignition voltage transformer also. Especially if you've already replaced both coil packs. I believe Mercedes recommends replacing that at 60k miles.
