How concerned should I be about a rattling noise with the check engine light?

[NathanR]

My car's check engine light is on and now there's a weird rattling noise

[Paisley.L]

That sounds serious a check engine light plus a rattling is not something to ignore you should get it scanned soon

[LarryEM]

If the noise is from the front end it could be a loose heat shield or suspension part a quick diagnostic will tell you what needs fixing

[Nicholas63]

In my experience a generic scanner code can be misleading so ask for a full diagnostic and avoid driving far until you know its safe

[Brandon.M]

Best move is to book a shop you trust and have them check it under warranty or as needed and keep an eye on how the car drives