I found this post when I searched the forums for other solutions for my P0300 code.
Quote:
Originally Posted by NissanTech
Cleaning the EGR passages is a good start and you should measure the resistance of the injectors as well. There is also a bulletin for the P0300-P0306 codes. The problem describe in the bulletin is very common. I’m not sure how did you cleaned the injectors, but you should consider doing with the stuff the factory recommend, it is very effective.
You can find the bulletin in the 2001 Frontier bulletin list: Knowledgebase - 2001 Frontier - Nissanhelp.com
Keyword Filter: "P0300"
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The stuff the factory recommended in the
service bulletin is 3M Universal Fuel Injector cleaner. Seems that you don't have to go to Nissan to get it.
Also, I learned that the purge volume control valve is not a $400 part like I had first read on the internet. Courtesy Nissan has it for $113.17. I will probably just go get one to see if it clears my code.