Hi, My 1991 prelude "check engine" light comes up when I start the car in very cold mornings, when I turn the car off and turn it back on after that, the light goes off.
Could someone please let me know what's the problem with that?

Thank you, very much!

1. Check for any codes being thrown.
2. The CEL coming on the way it does is an indication of a developing problem; e.g. a failing main relay or ECM. You may want to read sections A and B below:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-honda-civics-46563.html