I've read throught the posts about this issue, but was unable to get a good answer. My TCS & Check Engine light are on, and the dealer wants to charge 90 dollars just to diagnose it. What is causing this? I read something about transmissions? I have 80,000 miles on my 2001 Odyssey. How can i fix it for cheap?

The 2001 odyssey had a recall on transmissions. If your check engine light is on. Take it to the dealer and mention the transmission recall.