What's causes P0325 in Nissan Altima

Question

Engine light came on with P0400 P0325 codes

Answer 1

HI there

The P0325 code is for the knock sensor. Typically replacing the knock sensor will resolve the code. This code doesn't even turn the check engine light on. Here is some info

P0325 NISSAN - Knock Sensor Circuit Malfunction 

Read more: https://www.autocodes.com/p0325_nissan.html

The code P0400 is an egr code. Usually on these it's a result of a blocked egr tube, or sometimes a bad vacuum line or egr solenoid.