I started my car this morning from the outside by leaning in through the window and turning it on, to let it heat up.
About 20 seconds after, I heard my engine change in sound, similar to how it sounds once heated up, but a bit duller.
I then got in the car and noticed my check engine light was on. The idling of the car felt weirdly soft, but I had no problems driving ~20 miles to work up and down hills. I was sure to keep my engine under 3000 rpm, but didn't feel a big loss of acceleration.
Also my headlights have been flickering occasionally so it might be something alternator related?
Any ideas? Thanks. Will be getting codes read later when I am free.
Car: 2005 Honda Civic 4 door w/ 112k miles
UPDATE It was a P2647 Fault, which I then topped off the oil to fix. I think my oil level was really...really...low.... :(