Just had my Prelude e-checked today...... the limmit for CO detection is 78...... my car tested at 3.5!!!! That is 3.5 if you have to look twice!! And I have 61,000 miles on my car!!! And drive it very hard sometimes!!! Even the e-check supervisor was shocked. He said (not surprisingly) that Honda's are typically very good, they are teh cars which pass most often, but he was absolutely flabergasted with my car's performace. Even CO2.... that limmit was 0.43% and my car tested at 0%! And it's not even an ULEV. I'm not sure, but I don't even think it's certified LEV. It must be, or the engine and emission controls are perfect, anyway.