My car's check engine light is on and now there's a weird rattling noise
That sounds serious a check engine light plus a rattling noise is not something to ignore you should get it scanned soon to avoid a bigger problem
Dont drive it hard until you know what is going on a rattling from the front end can be dangerous so get it checked now
In my experience a rattling can be a loose heat shield or worn suspension and a quick diagnostic will tell you what needs fixing
I am not sure over text but a check engine light with a rattling usually means you should stop driving and have it diagnosed by a pro