PO325 PO455 - Car Challenged :'(

[triciah_88]

I have a 2000 nissan xterra tonight on my way home the SES light came on. I got the codes PO325 and PO455. It was raining and I don't hear/see/feel anything diffrent with the car. I don't know much about cars but my dad does. I was hoping we could fix whatever is wrong but after doing some research it looks like the knock sensor is difficult to get to.

[Saudade]

Don't know where the knock sensor is either but as long as you run decent gas, you should be OK. I've run without a functioning knock sensor in my Jeep for years.

The P0455 points to a large leak in your evap system. Double check your gas cap (make sure it's tight), and look at the lines going to the evap canister. You may want to reset the codes and see if it comes back.

[1991Hardbody]

I agree. Nissan is famous for setting false knock sensor codes anyway. I've seen this code come up millions of times with no issues.
Evap code could be broken line(s) or stuck open purge valve at the evap canister. Clear the codes and see which one comes back.