Hello everyone, I am new to this place, so hello! But I have some questions about my 05 Cobalt. I just bought it around two weeks ago. I have a 4 door LS Copper Cobalt. I love my car so far! But I have been having some problems, and wanting to see if anyone can help me. First of all the same day I drove it off the lot, my check engine light came on. Well I took it to AutoZone to see what was wrong, they told me it was a Catalytic converter. Well I took it back to the dealership, and they sent it to a local Chevy dealership to get it replaced. Well I got it back, and the light was off for the rest of the day. Next day I was driving around, and it came back on. Now I dont know whats going on? Also, my car seems to be eatting gas like crazy! Whats up with that? It takes it about a two days to get down to a half tank? Anyone else have this problem? Please help me if you can! Thanks so much!