I have a nissan maxima 2013. I got "Service engine soon" recently. I showed it to autozone to pull up the reason and they told me it is p014E, O2 sensor slow response,-Rich to lean bank 2 sensor". Checked for the price it was $369 for Bosch and $223 for Denso. Any idea if I need to buy a sensor? If yes where can I get the best deal? Can I replace it by myself?

 

you'll need to replace the sensor...yes.
best deal...have to check around. ebay, rock auto, just have to look around.
can you replace it...depends on your mechanical ability.
i believe bank 2 is on the firewall side so an sensor socket/tool would be a good idea and reaching in there to unscrew it. it's going to be a tight fit from the top.

 

Check out Rockauto: http://www.rockauto.com/en/catalog/n...2)+sensor,5132 . Their prices are a lot more reasonable.