Check engine light on 2002 Hyundai Accent

can you list causes and symptoms for the check engine light?

Asked by for the 2002 Hyundai Accent
To many to list. Have scanned and post codes for further advice , if needed.
I went to AutoZone & they tested. P0133 was code. I had the bank 1 sensor 1 o2 sensor replaced. This was 2/7/13. Check engine light still on. Went back to AutoZone and they retested. P0133 code came up again. I have been told after about 5 - 15 drive cycles, or freeway driving, or full tank of gas, etc. the computer/check engine light will reset and go off. So far it hasn't. When it tested a 2nd time at p0133 does that mean there is still a problem (other sensor) or it just hasn't reset itself yet? Thanks