My engine light came on for 10-20 seconds 3 times, usually when I just worm up the car and start to drive and only once untill the next time I strat to drive after a while. 4 possiblities, can it have to do with a blow off valve I put on, can it be that I got rear ended not to hard but dented trunk and hole in bumper, and it started to happen that day, I had very low oil, or just some other problem?