Hey guys i have 2000 honda accord that recenlty go the catalytic converter stolen, today i installed a new one with the sensor, i even did a full tune up and changed the alternator as well but my check engine light is still on, the all door ajar light is on and the brake lamp light is on as well .the car was running perfectly fine before they stole the catalytic converter ..
Need help!!!

 

Welcome to HAF.

Get the codes and post the actual code(s). Next be sure all of the brake lamps are working properly (check with and without the headlight on).

Are all of the door and trunk "open" lights on?

Last, I'd be sure the battery and battery connections (all ends of both cables) are clean and tight.