I'm still learning about my car and I have only the basics down. I have a 2000 v6 and minimum mods on it. Like a cold air intake and little things like that. I have 4 codes being thrown and I'm fed up with trying to fix them. They are: P0174 P1309 P0420 and P0455. I honestly want to throw it in the shop and leave it for a few days and come back and have everything fixed. Lol. I have no idea where to even start with fixing these codes. My car has been sitting for the last two years and I just got it legal like three months ago. I just replaces the EGR and the hoses and the DPFE sensor to get rid of one code and three more showed up. It feels like I also have an exhaust leak if that makes any difference. And I have no cat converters. And I have a misfire too. Even though I just replaced my spark plugs. Where should I start on this? I'm totally lost and frustrated at this car. Any and all help is greatly appreciated.

 

This should give you an idea on where to look.