Good Morning,
i have a 2014 Honda Civic SI with 160k miles on it, a few months ago after a I accidentally downshifted the car went into limp mode, I turned the car off and on again and the problem went away, a few weeks later my alternator went bad so I had it replaced. A few weeks after the warning lights came back on my dashboard but no limp mode, I disconnected and connected the battery like everyone said but the problem returned. The lights will go away and stay off for 2-3 weeks at a time but they always come back.
I checked the check engine light and got a code for Cylinder 1 misfire, I then checked all the spark plugs, plugs and injectors and they all came back fine. I finally gave in and got a shop around town to inspect the car and he couldn’t find the problem ether he said he did a leak test and couldn’t find the problem the only thing he noticed was that cylinder one had 10% less compression than the other 3 cylinders but still remained to specs (according to him). He recommended I take it to a dealership to check the ECU. The only thing I notice is that the car has a bad oil leak near the VVT solenoid on the passenger side of the engine bay.
any suggestions on what this could be?

 

When you accidentally downshifted did the RPM go above the redline of the tachometer (RPM gauge)?