got 1995 honda accord inspected and failed, said high CO..I changed the air filter and how do Know if the 02 sensor is bad.
the CO2 standard is .76 and I have a 2.37....the check engine light is NOT on and the
motor runs good, meaning it runs smooth even idling. I thought maybe the 02 sensor was
bad since it could be a cause of the high co2. How do I know if it is bad.