For the record, if your check engine light is ever blinking, you need to immediately shut off your engine.
Shit is going very very wrong in your engine at that point, to the extent that it might cause an energetic catastrophic failure.
It can mean a misfire too.
I had an old accord that basically lost a cylinder (blew a valve or something) but could still drive down the road with check engine blinking because that cylinder was “misfiring.”
It happened far away from home too. I drove several dozen miles with my unintentional 3 cylinder swap.
To be fair, it can also mean “one of my fucking radiator fans is not responding quickly enough to computer control”
Which was not a fun experience when that happened to me, full fucking BEEP BEEP BEEP MOTHERFUCKER with a check engine and a STOP sign blaring on the digital system display panel, made me panic out of my mind because a radiator fan was a removed
In my case it meant the cilinders were scrapping against the block with zero lube
