You are right that CO in odor-less, but if you are smelling the fumes from the car, you are getting a lot of CO. CO bonds twice as fast with the red blood cells as does O2. So, you start the dive with lots of CO in the blood stream blocking the O2, now add the increase CO2 build up and you can see a pattern here. His symptoms sounded very close to what my buddy experienced after a dive on a dive boat (both of us experienced divers and trimix cert.) rainy day so he stayed below with all the diesel fumes in the cockpit and I stayed on the deck in the rain. He could barely get out of bed the rest of the day, I felt fine.
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