Yes, the third one should be dated 06-09-2006, not 2004.

Yes, it's been two years and you'll notice that back in 2004 (after the new cat was put on), the CO levels for both 15 MPH and 25 MPH were very low at 0.01.

The oil is the same oil from 2004. I never reached 3000 miles, so I never changed it. I'll change the oil to see if that helps.

The spark plugs on it are fairly new (changed in 2005). They were previously fouled because of the short distance driving. I'll probably check them out as well.

Esteves, You’ll pass with no problems down under...

Looking at these emissions prompted me to check out what the rules are in Australia for comparison. In Queensland, for pre-1986 vehicles, the percentage volume of carbon monoxide should not exceed 4.5 per cent and 400ppm hydrocarbons. (For post-1986 vehicles, emissions should not exceed 2 per cent carbon monoxide and 250ppm hydrocarbons.) [source http://www.transport.qld.gov.au/qt/LTASinfo.nsf/index/aircare_testing]

I now have a bit more of an understanding on the emission restrictions put on the Zeds over there.

Wait a minute - high octane fuel is worse for emission readings than lower octane? Is that right? Believe me - I dont know one way or another but it seems counter-intuitave....