Check engine light question

Since I had no time, I went to dealership to change my oil and engine air filter. After oil change when I turn on the ignition I started seeing check engine light but after I start the truck it goes away, I don't remember seeing this before, is this normal? At the dealership the servoce guy took me inside the servoce bay and showed me same behavior with another 4runner. This is my 2023 tacome OR.

 

This is normal. The key is set to "run" but the alternator isn't charging because the engine isn't started yet. So it says there's a problem with the charging system. My truck does this too.

 

Thanks for the quick response! I have seen the check charging system warning butbofnyou notice the check engine lightbisnalso on and I don't remember seeing that before when I trun on the key to ignition and not start the truck.

 

100% normal

 

Thank you very much!