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CHECK ENGINE LIGHT-CODE SAID CO2 SENSOR

I HAVE BEEN TOLD MY CEL CODE IS A CO2 SENSOR...SUGGESTED I HAVE IT REPLACED.... MY QUESTION IS ...HOW DO I KNOW IF IT IS A BAD SENSOR OR THERE IS ANOTHER PROBLEM CAUSING A CO2 PROBLEM THAT A GOOD SENSOR IS RECORDING? IF I HAVE THE SENSOR REPLACED COULD I THEN HAVE TO HAVE OTHER WORK DONE ONLY TO HAVE REPLACED A PROPERLY OPERATING SENSOR....
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