2002 Pathfinder P0430 and P0420

[willy0505]

Alrighty - next post in a series of posts.....so far, I have rebuilt the ECM (via circuit board medics), which helped cure rough idle, along with an IAC replacement, this was causing a short in the ECSS fuse under the hood. Next thing to repair was the smart entrance control unit, which was causing a short in Fuse #24 inside the car, next thing to repair was a P0302 code, which was corrected by a new Nissan spark plug (or wire jiggle that was a by product of changing the plug!!). In any case, I am now too deep in this car and one way or the other, she is gonna run without any codes!

Now I have the P0430 and P0420 (which came up about 8 to 10 months ago and stayed on a for a few weeks and then left). My question is - should I even bother to look for vacuum leaks or should I go straight to Chevron Techron and then if that does not work, change out each cat?

Thanks again Town and Chuck who always respond very promptly and accurately.

Willy

[ezb57e]

definitely rule out vacuum, or small exhaust leaks, like missing seal ring on bottom of cat or broken spot welds on heat shielding.