Need some help here. I have codes P0443 (EGRC Solenoid Valve) and P0325 (Knocking Sensor) and MIL is on.

I replaced three vacuum hoses that I saw in bad condition. 1. Vacuum hose from EGRC-BPT and EGR valves. 2. Vacuum hose from EGRC-Solenoid port "A" and "T" that goes to EVAP canister purge volume control solenoid. 3. Vacuum hose from EGRC-Solenoid to tubing that goes to air collector.

The EGRC solenoid tests good when applying 12VDC directly. The same for EVAP canister purge volume control solenoid. Both tested good.

Engine runs fine. At this point I have no clue.

Using Actron Scanner CP9180 and Nissan Service Manual.

Nissan Quest 1999.

+++++++++++++++UPDATE+++++++++++++++++++++++

I found the problem for P0443. There was a problem with the socket connector at the solenoid.

The only code remaining is P0325 (KS) which is known to exists in many Nissans but the MIL light is OFF now.