Car running great check engine light suddenly came on on 2001 Lexus IS300

I recently had my car in for spark plug changes (first time) the brakes done and ball joints replaced. All regular repairs that have never been done. The car's been running great. tonight the check engine light suddenly came one. 2 weeks ago the headlight balance light came on but is off now. what gives? how worried should I be? I don't feel anything wrong

by in New York, NY on July 05, 2012
1 answer 1 comment
ANSWER by on July 06, 2012
SCAN CODES AND POST IT COULD BE A NUMBER OF ISSUES EVEN A GAS CAP
COMMENT by on July 06, 2012
thank you, I will try the gas cap first and see where to go from there. If it is the cap, how long before the light resets? or will it on its own?