My girlfriend has a 2015 Mitsubishi Outlander, 2.4L. Yesterday morning she left for work and made it about 1/4 mile and had to turn around to come back home. It started running very roughly, the service engine soon light was flashing! I used my scanner to scan it. The P0302 code (cylinder 2 misfire)popped up. I decided with 130,000 miles that I would change the spark plugs. It needed rear brakes too. I replaced all of the spark plugs and changed the brakes. Once I put everything together, I had to use our battery jump box to start it. The car started. I let it run for a few minutes. Then it all started again. The scanner said code P0300 (random cylinder misfire) this time. This morning I took all of the plugs back out, put them back in, and checked all of the connections. I had to use the jump box again but once it started it through code P0302. I switched the coils on cylinders 2 & 3! I restarted it and it still showed the P0302, and It also through codes B1476, B1558, B210A, B2353, B1A25, B1A35, B210D, and B1691. I looked them up, but I can't remember what all of them are. Some are low voltage things. I thought it was maybe the battery, but then it began to start without the booster. Any ideas are greatly appreciated!

 

I’d start with the battery since it sounds like it needs one anyway.

 

Thank you very much!

 

Update, I replaced the battery. Fixed all of the low voltage codes. Still running poorly and throwing p0302. I've swapped plugs around and at different times swapped coils around. I did notice that when I swapped the coils for cylinders 1 & 2 that it seemed to run worse. But it still says code p0302. Any idea how long it should take for the computer to update itself on a new code?

 

It’s apparently a #2 cylinder misfire. I’m 99% sure this is the same engine as the lancer so any google info you can find on it should be good.