I have a 2000 Toyota Sienna that is in great shape and that is being kept in great shape with service records at the local dealership. The Emission test was required at the time of plate renewal. I took it to the Pennziol (Penzoil) 10 Minute oil change for an Emission test. The car used to score 14 or 16 on the Nox criterion. To my surprise it failed for over 1000 on the Nox reading. I tried to explain to the technician that there is no way this is my car that scored such a reading given that I never had the engine light on. They showed no interest in even looking into my claims. Without doing anything to my car, not even changing the oil or adding gas or any additive, I took it to the Ottawa Emission Centre the following day and it passed with a 16 Nox reading. I took both reports back to Pennzoil (Penziol) but they did not listen. I complained to the Ontario Drive Clean program and escalated to my provincial representative Jim Watson but they were not of any help to my complaints.
I don't recommend Penzoil (Pennzoil) for an Emission test. I also think that the Emission test is a money grab that the Government of Ontario is making money out of by licensing the test centres and that the government does not show any mercy to anyone being treated unfairly with un-tuned test equipment. The hill with McGuinty.