Check Engine Light
I have a 1985 MR2 MK1. For the entire time I have owned the car (more than 30 years), the check engine light will come on occasionally and unpredictably. Sometimes after I have driven the car for a while, other times it goes off (or on) when I hit a bump. The car runs with no problems, and always starts right away.
So you never scanned the car in 30 years? You got a good run. Time to do so if your concerned, or just drive it till you have driveabilty problems.
I have had dealers scan it. When I first bought it (used) the dealer I bought it from said it was the O2 sensor (which he said he replaced). I recently took it to my local Toyota dealer, he said it was the distributor (which he wanted to replace for $600+). The question I had was more related to the fact that it doesn't come on and stay on. What could cause that. The car runs great.
Search Toyota MR2 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Toyota MR2 Experts