before you buy the o2 sensor you better check the fuse under dash driver side and or under hood for a fuse called htr if blow just replace it an see if the light goes off worked for me that's why iam sharing hope it helps peace out!!!!!!!!!!!
code po141 on 1996 Toyota Corolla
FUSES DON'T CONTROL 02 SENSORS USALLY BUT COULD BE WIRED WRONG OR ITS AN ECM FUSE. PEACE OUT