1. P0401 - EGR System Fault ( To Little flow on the system)
2. P0135 - Heated Oxygen Sensor Bank 1 Sensor 1
3. P0301 - Cylinder misfire, cylinder #1

1. I'm not sure what to do about number 1 because I don't know as much about exhaust gas recirculation, so how can I solve that problem. With details please..

2. I'm going to change the oxygen sensor tomorrow, but i don't know which side is bank 1.

3. Could problem number 1 or 2 be the cause of a cylinder misfire? The plugs and wires in my car are only 1.5 years old.

Also, i've got 135,000 miles on my baby...