Question

1999 Chevrolet Trailblazer 4.3L with code P0325, already replaced knock sensor and wiring with OEM parts, service engine light still on

Answer 1

Hi there,

Since replacing the sensor and wiring hasn't solved the issue, it's most likely an issue with the PCM. Here is some more info for you.

P0325 CHEVROLET - Knock Sensor Circuit Malfunction

Read more: https://www.autocodes.com/p0325_chevrolet.html