Question

What if p0430 is combined with p0300 on my 1999 Nissan Pathfinder 3.3L V6?

Answer 1

P0300 NISSAN - Cylinder Misfire Detected Random Cylinders

Read more: https://www.autocodes.com/p0300_nissan.html

You should try to fix the P0300 code first. There is a factory service bulletin for the P0300 code on the 1999 Pathfinder. The bulletin suggests performing an injector flush to clean the injector.