trouble code P0138 o2 sensor circuit high voltage. Any fix ideas or past experience here?

 

The problem is your secondary O2 sensor
Read this
http://nissanhelp.com/diy/maxima/pro...r_location.php

You need to replace the following O2 sensor or
HO2S2 (B1)
HO2S2 (B2)

Install O2 nonfouler to each secondary O2 sensor . Buy the spark plug Non-foulers (brand HELP 42009 18mm w gasket two pieces) and 1 inch drill bit. You need to drill one of the tip of this nonfouler so the tip of O2 sensor will fit.
Watch this
http://www.youtube.com/watch?v=KnYUHwTxKkE
Ideally its better to gut the two pre cat.

 

Thank you

 

I had a p0430 code and service engine soon light. So i went ahead and bought a catalytic converter from ebay but didn't have the money to get it installed right then. So i let a month go by and both the service engine soon light, and the p0430 code went away? Will it come back...? I've done things such as installing a pop charger and getting my starter replaced but other then that nothing. What do i DO? (should I hold on to the cat/sell it/get it installed?)
P.S I now have p0325 and p0335 codes
Any advice is appreciated

 

Any help? hehe...