One problem related to catalytic convertor has been reported for the 1999 Toyota Corolla. The most recently reported issues are listed below.
My 1999 Toyota Corolla has its check engine light on for the two years. The code is p0446/0441 and when winter comes it goes away and re appears in summer. I first noticed that around 36000 miles. The dealer says it is a canister problem, but could be something else and I see that there a lot of Toyota owners who are seeing the same compliant. Also for the last 2 days I see that the seat belt not put sign start to flash even if you have the seat belt on.