After leaving the store yesterday, went over a pretty bad speed bump and almost immediately after my car started making loud noises (almost like a motorcycle) when accelerating and now idles roughly. Car through code p2196. Just last month the cat and O2 sensors were changed at dealership. Oil levels are good and oil was changed maybe 500 miles ago. New filters and new vvt solenoid and purge valve were put in. Car has 150k miles on it. Any thought? I’m thinking exhaust leak

 

You are very likely right , here is how to prove it.

Have someone sit in your vehicle place it in gear apply the parking brake and FOOT BRAKE while applying a little throttle.

If you lie down near the side of the vehicle, you should get some idea of just what area the leak is originating then you can decide if the dealership didn't do a good job or possibly something else separated.
Always use good judgement when attempting to do this and,Don't get in front of the vehicle.

 

Thanks for the response. Took it to the muffler shop this morning. Turns out just like you said dealer didn’t tighten the bolts enough. Gasket was missing and one bolt was missing, the other barely holding in. One new gasket and two bolts later and car is running great, no dtc codes

 

Thank You for the update.