So I changed out basically the whole front suspension because I could get the car to stop pulling left after lowering and putting on 18s ... I also changed to unorthodox underdrive pulley... Before all this work today I had a knock sensor P0400 and an egr code P0325 I believe ... I notice the check engine light is gone ???? And I've driven ten miles since ??? Is this poss should I still change the egr and knock sensor?

 

Ummm, does it still pull left?

 

Lol nah doesn't pull anymore .. Thank god but it was just wierd that the cel is off now and my gas mileage is back... But I'm having a weird hum kind of noise coming from the engine bay ?? Tested the alternator and battery at advanced auto and everything was ok.. I dunno what it could be

 

During your project(s) did you have the battery disconnected?

If so, you simply cleared your codes and they'll likely return in time.

Suspension work is rarely the fix for an EGR and/or KS issue.

 

Yea that's what I'm saying I was amazed that this happen lol... I'm sure we didn't disconnect the battery though ... Terminals are shot so maybe it did on it owns ...but I've disconnected the battery plenty and never... I'm gunna run the codes later see if they are there... Maybe I got controls sent from the nissan gods lol