Question

I have a 2000 Infiniti QX4 with codes P0158 and P0159 and P0325, which sensor should I replace and where is it?

Answer 1

Hi there,

The P0158 and P0159 codes are for the rear O2 sensor on the driver's side. This would be the one located behind the catalytic converter on that bank. Both codes are for the same sensor.

P0325 is a knock sensor code. This code is very common and won't even turn the check engine light on. The only reason you see it is because the light came on for the other sensor.

Comments

So where the knock sensor located at

Answer 2

P0158 INFINITI - HO2S22 Circuit High Voltage
Read more: https://www.autocodes.com/p0158_infiniti.html

P0159 INFINITI - HO2S22 Slow Response
Read more: https://www.autocodes.com/p0159_infiniti.html

P0325 INFINITI - Knock Sensor Circuit Malfunction
Read more: https://www.autocodes.com/p0325_infiniti.html