Just got thebad news on the e-test. HC and CO well within limits but NOX approx 30% over limit. I was 1213ppm limit is 0805 ppm at2000 rpm. I'm thinking vac leak and/or temp was too low and possibly stuck thermostat. I'm up in Toronto, Ontario and it was approx 45F andI don't think engine was up to temp during the test. All in all she runs great and I have no other problems. Anybody have suggestions. Only about 190,000miles on it, full tune-up done and I use Castrol high mileage oil.