P0302 error, plugs replaced, Coil Pack replaced - still misfiring
Thread Starter
Newbie
Joined: Mar 2020
Posts: 7
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2017 c43
P0302 error, plugs replaced, Coil Pack replaced - still misfiring
Cylinder 2 is misfiring when I hit 3500-4000 rpms. Car goes into limp mode. If I turn car off, and start again, limp mode is gone unless of course I exceed 3500-4000 rpms. I replaced all spark plugs with new NGK iridiums and also replaced the Coil Pack on cylinder 2. I cleared all codes. Problem has not gone away. As soon as I hit the rpm range it throws code and goes into limp mode.
Car is drivable if I drive "sensible" and avoid getting into fun mode.
What other things can I check or replace easily? Or is it time to take it into my local Mercedes shop (not a dealer, still expensive and uses OEM parts but better prices on labor).
2017 C43 Sedan
Car is drivable if I drive "sensible" and avoid getting into fun mode.
What other things can I check or replace easily? Or is it time to take it into my local Mercedes shop (not a dealer, still expensive and uses OEM parts but better prices on labor).
2017 C43 Sedan
Last edited by Bsc7080mdo; Jan 26, 2023 at 08:35 PM.
Senior Member
Joined: Mar 2018
Posts: 323
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From: Central Florida
'15 C400 and '15 ML350
Might try swapping injectors around. They have been known to go bad or leak. (common part # used on a lot of MB motors)
Also are you sure you have cylinder #2 identified correctly? Passenger middle cylinder?
Also are you sure you have cylinder #2 identified correctly? Passenger middle cylinder?
Thread Starter
Newbie
Joined: Mar 2020
Posts: 7
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2017 c43
Yes. Passenger side middle. I will look around here and elsewhere for a guide on injectors. I haven't messed with those before. Thank you.
Junior Member
Joined: Aug 2023
Posts: 23
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C43 AMG
How did you fixed it please ??? 🙏🙏🙏
Junior Member
Joined: Aug 2023
Posts: 23
Likes: 2
C43 AMG
Cylinder 2 is misfiring when I hit 3500-4000 rpms. Car goes into limp mode. If I turn car off, and start again, limp mode is gone unless of course I exceed 3500-4000 rpms. I replaced all spark plugs with new NGK iridiums and also replaced the Coil Pack on cylinder 2. I cleared all codes. Problem has not gone away. As soon as I hit the rpm range it throws code and goes into limp mode.
Car is drivable if I drive "sensible" and avoid getting into fun mode.
What other things can I check or replace easily? Or is it time to take it into my local Mercedes shop (not a dealer, still expensive and uses OEM parts but better prices on labor).
2017 C43 Sedan
Car is drivable if I drive "sensible" and avoid getting into fun mode.
What other things can I check or replace easily? Or is it time to take it into my local Mercedes shop (not a dealer, still expensive and uses OEM parts but better prices on labor).
2017 C43 Sedan
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C43. GS-T Spyder. 20th AE GTi.
Well I pulled the plug on cylinder 2. The gap was just about .000. Re-gapped and went for a drive. felt much better but I didn't drive far enough to clear the code itself. Cleared the code when I got back. Time will tell if that was the fix. It certainly needed re-gapped either way.
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