I don't know if this is true but a few days earlier someone posted that if you spray tire foam on your engine that it might foul the o2 sensor and I think that is what I did to my dads van. I washed his engine and spray Black Magic Tire Foam on it. It looked great but a few months later the check engine light came on and it was the o2 sensor. The car only had 45k on it at the time. So word of advice don't use a tire foam to dress your engine. PS, the tire foam attracted so much dust that it got nasty fast too. Also, what is a 9C1s may I ask?
