Good numbers! Notice how that last 0.1% O2 was consumed during the 25 MPH test to lower HC and CO. The converter was operating at essentially 100 percent oxidation efficiency during the 25 MPH test - not quite during the 15 MPH test. Once all the O2 is consumed the emissions can't get any better. Your low NOx numbers indicate that the converter is reducing NOx very effectively, and the better the NOx reduction the more oxygen is freed up to oxidize HC and CO. Your NOx can't get much lower, so the limit of oxidation due to lack of oxygen has been reached. The low CO indicates the O2 sensor and KE system are in good health and keeping the mixture at the stoichiometric level.

Your CO2 numbers are low, but it could be that our new gasoline with ethanol rather than MTBE as an oxygenate has reduced the carbon/hydrogen ratio of the fuel to where the maximum CO2 is a little less than than 15 percent rather than a little over 15 percent.

The limits for the 300E and 190E 2.6 are a little higher. Because they are lighter they are allowed slightly higher proportional emissions due to less power required and less total exhaust flow. These limits keep changing based on the CARB's continuous updating of the statistical model data. You can be guaranteed that they will be a little different for your next test. The NOx limits go all over the place. I think they're still trying to figure out how to measure NOx properly, so the limits are pretty loose.

The fuel cap test is actually a pressure test to ensure that it will hold about 1.0 psi. This is a test of the car's evaporative emission controls. If the cap fails, it's probably just the gasket. Mine failed a couple of years ago, and I asked the guy to retest it. He did and it passed. It passed in February.

If your cap fails and you have to come back and have it tested, you have to go through the entire test again.

Maybe we can get the new governator to put some logic and sense into this emission test chicanery.

If anyone else has recent Califonia ASM (acceleration simulation mode - the chassis dynamometer test) emission test data, I'd like to see it.

Duke