My Car is a sentient being...

I had to take it in for an emmitions check on Friday. Problem is my "Check Engine" light has been on since 1998. So I take it in to get repaired, tell the guy my "Check Engine" light is on, he looks in on the dash and says "no it's not". I look, and it's off. For the first time in 10 years, it's off. So I take it to the "Clean Air" test facility, they plug their computer into my car computer ( I didn't even know my car had a computer ) and I pass the test. No problems, pass the check. Drive away from the testing place, the engine light goes back on. SPOOOOOOOOKY!!!!!!