Check engine light came on, went to auto zone, they said O2 sensor at bank 1 was slow to respond.Replaced the O2 sensor on the driver side b4 cat.Engine light still on.Anything else I can check?

 

welcome Bloodrage, bank 1 is the
passenger side. try the 02 before
the cat and let me know what happens.

 

A friend of mine suggested I remove the battery cable to reset the cpu.I did and the engine light no longer comes on.

 

I had this problem too. But mine problem came up a few weeks after installing longtube headers, which I suspected (at the time) was the problem.

A great thing to try in debugging this is to swap the front driver & passenger side O2 sensors with each other. Then clear your codes. The code will likely come back and hopefully the code is now for the other side - which would mean you simply have a bad O2 sensor. That was the case with me.