I have a 2001 4runner with 124000 miles. My vsc track, vsc off and engine light came on in Dec. of 2005. Took to dealer, said it was catalytic convert $1300.00. I searched for different options. Went on vacation for 7 days in Jan. and when I got back all lights were off and stayed off until Sept 2006. I will try replacing the gas cap first before doing the catalytic converter. A 2001 4runner has 2 catalytic converts and the back one is the cheaper one.