I am getting a mil light, code number 91 ( front 02 sensor heater). Does this mean my 02 sensor is bad or is there something else I should check?

hey njb
i like you am getting a freakin mil light -i went to get my smog today and failed the test cause of this, everything and i say everything pass visual + emission but fail solely because of this. so i havent pulled code(s) yet but if you found out any thing let me know
peace
lamar

I don't know what was causing the mil light I had. I did cure it though. I pulled the front 02 sensor out of the header and unplugged it from the connector. Then reinstalled it, and low and behold no mil.
You should pull the code and find out what is wrong. Then just reset your ecu.