engine check light

[Capsat]

I'm getting the engine light for last two months, it comes up after driving for sometime. I've put in new engine oil, changed air and oil filters, had service but the light just wont go. model is Vitz 2000' auto transmission 104,000 kms.

There is no deterioration in performance need help please

[WeeYari]

Way to little information to really help diagnose problem. Very common cause of a code which does not affect performance is gas cap related. You may have a bad seal on the cap.

Another cause on a 12 year old car could be a faulty O2 sensor.

You're going to have to get your check engine codes read.