just did this after installing a cheapie ebay SS header.
After my fight with the EGR pipe, this was a breeze. ...but now I'm throwing a P0031 almost instantly. Flashed the ECU and all.
P0031: HO2S Bank 1 Sen 1 Heater Circuit Low
Should I assume Bank 1 Sensor 1 is referring to the top O2 sensor (on a stock setup, this would be the O2 before the cat (ie. no non-fouler on this guy))?
Any help is appreciated.