Related question, or maybe not. I have a crapload of codes. Most of them are O2 sensors, but some I've never seen before--C3064, C2174, C342D. I look these up and I get all kinds of different answers as to what they are. Is it possible these are related to the wiring harness being bad, or do I just have sensors committing hara kiri all at the same time throughout the engine bay?