I have a 96 Nissan Maxima, 3.0, V6. My knock sensor is bad. Could anyone tell me where it is located?

 

It is between the intake manifold and the block.

What codes are you getting? 0325?

 

What makes you think is bad?. The knock sensor is on the block under the intake manifold, it will Not turns on the check engine light although it's always there when reading the DTC. If you have more than 1 DTC and one of them is Knock sensor, ignore it and go after the other code.

 

i'M GETTING a 0325 and one for an evap emissions leak. but I forgot to write it down.

 

I wouldn't worry about the knock sensor code, I'd look into an Avap leak first, it could be a lose gas cap and or bad evap. vent control valve, they are the most common problem on that model year, sometime you'll see something else like pressure sensor but.....

There's a "not so accurate way" to check the vent control valve without tool, you can try but again, it's not by the book.

The Vapor canister is located on the left rear of the vehicle, there's a vent cont valve mounted infront of the canister which have one rubber hose and an electrical connector on top, let the engine warm up and at idle for about 20-30mins, put your hand on the valve, if it's hot, it's toasted, if it's cool and you can feel it "clicking" once in awhile, it's OK.
On the back of the canister, there's another rubber hose that goes to the rear of the car's body , you can use the mirror to look inside of the openning of the hose, if you see any obstruction like spider's web, the valve is gone.