<!-- from fixya rte -->How do i set the co2 level - 1998 Hyundai Elantra

The only way to get these would be to contact the dealer.

Cheers

you can try with your local pollution control centre

Have you had the ECM checked?

The ECM controls your fuel to air mixture as well as monitoring the CO2 levels.

Also, have you checked the oxygen sensor, when there's too much oxygen intake,,, the ECM increases fuel to compensate for the excess air, and thus results in more CO2.

Another check would be to find the diagnostic port, (usually under the dashboard), and, to either hire, or borrow an OBD diagnostic tool and see if there is an error code displayed, beginning with 'P', the code will show you what component is likely to be in error for producing the high CO2.

retest could be a contaminated gas anilizer high co2 isnt a bad thing it means teh cat is working high CO is a failing cat whats the hydrocarbons at

no tuning can be done as its all fixed jets apart from the idle which can be adjusted to a CO2 level less than 2% for the emmisions on the annual vehicle mechanical inspection

my rav4 2004,seems to pull back when driving about 20 to thirty miles an hour, like a flat spot or pinking

the cat has the ability to reduce the co2 levels ,so it needs the cat to pass the mot

If it is using any oil, I would replace the valve seals. That can cause a failed test.

Are you sure it is CO2 and not just CO Carbon Monoxide??