If you're not a grease monkey, take it to your friendly mechanic. No need to go to dealer on this one.
exactly my thought too sir
That should be the front 02 sensor before the catalytic converter. Takes nothing more than a 13mm wrench and a 02 (22mm) sensor remover with breaker bar. Heck, you can do too if you know any sense of removing a bolt. Just remove the negative terminal in the back for your battery, then remove the wire harness adapter (may take a flat head screwdriver to get it loose). Take that 02 socket and remove that, then back track the 2 steps and fire her up
And forgot very last step, clear the code with a scan tool like a Modis, Ethos, or Tech III.
2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille