co2 sensor on 2009 chevy colbalt

Check fuses heated o2 sensors sometimes have their own fuse

will check today, will let you know later.thank you

Google the trouble code. There are usually multiple possibilities as to why the computer "thinks" the O2 sensor is bad. If changing the sensor once didn't solve the problem changing it again two more times is not going to either. Broken wires, bad connections, faulty grounds, even other failed electronic components and yes, faulty relays and fuses can send false signals to the computer. You've eliminated the O2 sensor as the problem, now its time to dig deeper.