soo the other day my check engine light turned on and i was like **** wtf is wrong with my truck and then i went to auto zone and they told me what was wrong with it and the catalaic converte is not working properly soo the stuff inside isn't fuctioning right and cleaning it and how its supposed to...soo wats the worst that could go wrong cuz i was just planning on leaving it go cuz heck nothin is gonna f up the motor soo idk maybe once it starts ridin different ill get a new one?...what do u think??

 

It could also be the rear O2 sensor is bad. Check with AutoZone to find out the code number. If it is the CAT going bad, you will want to get it replaced, or you either start loosing power or you can cause engine damage.