Question

What is the meaning for code P0301 and P0430 for 2005 Nissan Pathfinder SE 4.0L V6?

Answer 1

P0301 Misfire cylinder 1

P430 Catalytic below threshold bank 2.

Misfire can be caused by a faulty coil on plug or harness that connects to coil on plug number one cylinder,rule of thumb if its a COP (coil on plug) thats faulty you replace the sparkplug. and make sure its not oil contaminated from the inner of the vakve cover. You also shold check the harness on COP sylinder one, As for P0430 Thats lean catalyst bank 2  this is where cylinder number 2 is at. check for a vacuum leak at this bank,also how are the sparkplugs? either way if you truly do have a failed catalytic you are going to need a tune up anyway

Answer 2

P0300 NISSAN - Cylinder Misfire Detected Random Cylinders
Read more: https://www.autocodes.com/p0300_nissan.html

P0301 NISSAN - Number 1 Cylinder Misfire Detected
Read more: https://www.autocodes.com/p0301_nissan.html

P0430 NISSAN - Catalyst System Efficiency Below Threshold Bank 2
Read more: https://www.autocodes.com/p0430_nissan.html