co2 sensor on 2009 chevy colbalt

Asked by tonytony1 Sep 14, 2018 at 05:35 PM about the 2009 Chevrolet Cobalt

Question type: Maintenance & Repair

changed co2 sensor 3 times,check engine light goes off a little while comes back on,brand new parts, diagnostic says its the sensor, what do i do?

3 Answers
18,715

munron answered 6 years ago

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.

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