what is wrong when there is high CO2 level in a 2005 Chevy Cobalt?

Asked by Mar 17, 2014 at 01:26 PM about the 2005 Chevrolet Cobalt Sedan FWD

Question type: Maintenance & Repair

When the car goes above 20 miles an hour my check engine light flashes.  I had it checked at Auto Zone and the code gave a high CO2 level reading.

2 Answers

270,495

Can you post the 4 digit code?

2,875

Possible causes are 1) Faulty HO2S (Lambda) sensor or 2) Faulty coolant temp sensor.

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