Originally Posted by NickAdams

MtnRunnin,
Have you opened up the engine wire harness above engine on firewall to see if it got wet during pressure wash? This should be easy enough to do: un-clip it and un-tape it. Look carefully for bare or corroded wires. Also, you might want to check to see if water got in the harness through firewall, and followed to ECU connection up under glove box, causing corrosion ("fretting" in technician parlance.) Good luck!

Originally Posted by MtnRunnin

Thanks Mike, that's why I was asking what role the IAC played since it ran fine with it unplugged. I was trying to expand my knowledge on that subject.

I checked the O2 sensors with the scanner and bank 2, sensor 1 was reading 0. I swapped the two front sensors to see if the 0 reading followed. It followed, but the p0150 stayed along with a new p0154 code.

I believe I got a faulty O2 sensor from the auto parts store, so I'm swapping it today. I'll let ya'll know if that fixes the issue.

Also, I've cleaned the connections a few times to ensure there is nothing blocking signal.

Thanks