Hello,
Technically, a vehicle does not need a muffler to run properly, it just makes the vehicle's engine exhaust quieter for other drivers on the road. A missing muffler shouldn't cause your vehicle's Malfunction Indicator Lamp (MIL) or "check engine" to illuminate. Can you pull the Direct Trouble Code (DTC)(s) for us? Here is a link explaining how to do this if you are unfamiliar with how to do it:
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
Please go through this guide, if needed, and get back to us with what you are able to find out. We can go from there.
Thanks,
, Alex
2CarPros
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Sunday, June 30th, 2019 AT 12:53 PM