Hi guys i have a 1999 Nissan Altima, its a 4 Cylinder 2.4 engine i need to pass inspection and im having major problems with check engine light , there are two codes that keep showing up P0325 Knock Sensor 1 Circuit Malfunction Bank 1 or 1 sensor, and P0720 Output Speed Sensor Circuit Malfunction, these are the codes that show up. Now i have changed the Speed Sensor on the car and after reset and driving for around 70 miles the check engine comes back on and also it still shows that same code for Speed Sensor which i have already changed ? Can some one give me a diagram where the Knock Sensor is located in the car ? And why would the Speed sensor code show up when i changed it with a new one ? Any help will be greatly apreciated.

Everything you need will be in the FSM: http://www.nicoclub.com/FSM/Altima/1999/

ec.pdf is the one you want.