I had to get my Corolla inspected at the end of November and after waiting for around 2 hours, I found out it failed for emissions, and the codes that were "present" are P0171, P0446, and P1349. I had 45 days from then to get it inspected again, so I have a few weeks before I have to bring it back. Has anyone had these codes before? Is there any way I could fix them myself without biting a huge bill at the garage? If not, how much should I be prepared to pay? Thanks!