Hello Everyone! I just bought a 1997 F150 supercab. The lady that i bought it from told me that a mechanic told her that the o2 sensor needs changing. I was wondering if anybody could tell me how to use the obdii. Thanks, look forward to hearing back from somebody

 

You need a scanner to use the obd2 port to read codes. Take it to your local auto zone or oriellys and they will scan it for you.
The obd2 port access is down by your right knee under the edge of the dash.