1 O2A - Oxygen sensor #1 im throwing where is the sensor located i have a 96 civic hatch with a b16a2 and what can be some problems on why i am throwing it. my check light goes on and off but its seems like it only goes off when i floor it but today it was going off and on like crazy when i got done racing normal driving it would go on and off and to not keep it on i would have to turn my car off and start it back up and then the light would go away need help

 

It should be in the bottom of the header just before the cat, they go bad from time to time. It screws into the header and the wire end is a plug.