Emissions test failed due to high CO2 levels in IDLE

[heshan]

Hi guys,

I just did my emissions test and it failed!!

They said that the idle CO2 rates are above the limit.

I was told to clean/replace my air filter and also clean my injectors. Next time I was to run this test WITHOUT my air filter and see if that's the problem ..

But do you guys have any pointers? I did this test after I drove around 40km in the city and I was thrashing it a bit..

I noticed my idle was hovering around 1100rpms and I think thats high.. My car is a 4AGZE from an AW11.. I'm wondering whether I should check my MAF and see if there's any servicing needed there.

Also to reduce the idle RPM would the screw on the MAF module help?


Help?

Thanks,
Heshan.