I have a question if anyone has some advice. I have a 2008 Scion XB, 154k miles. The check engine light came on spitting out the code P0172. Which it looks like is typically the MAF sensor. So I brought it in to a mechanic, they said yes the MAF needs replaced. But they said also possibly the whole engine wiring harness might need replaced. They will let me know after replacing the MAF sensor.
I don’t know much about wiring harness but it looks like they cost north of $1,000 to fix. Here is my question…it seems that they don’t normally need fully replaced unless there is some serious damage (fire or something). I haven’t actually notice any symptoms while driving, it is normally smooth and no weird revving or anything.
Should I just not fix anything unless some symptom occurs? Should I find a shop that could fix whatever wire is actually broken? Or do I need to replace the whole dang thing? Any advice is appreciated.