Yes. If the light is blinking when the engine is running, there is a misfire which is likely related to a fuel or ignition issue. These types of misfires can cause damage to the catalytic converter. If it isn't blinking and you have a misfire code, it is likely emissions related.
Now, when you first turn the key on, the check engine light should turn on. Some stay on until the engine starts and others will turn off before starting. However, it shouldn't blink when the engine isn't running.
I hope that makes sense. LOL
Let me know.
Saturday, October 10th, 2020 AT 8:11 PM