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I'll just check the pins for the 2 white wires, black is the signal grey gnd as the corresponded to the plug. I did have a 155 code a couple weeks ago.

So my battery died, I disconnected the battery while I charged it. Think my 5yo battery is going bad. Changed B2S1 a couple weeks ago, for same issue. While over analyzing stuff and looking at trims and watching some videos, I learned that the ECM will compensate for a bad o2 by using the trim...

I've also measured the temp on my cat and they seem to be in working order.

My bank 2 o2 sensor takes forever to show a signal, then will usually just show .1v or .9v then will actually act "right" after around 20min. Starting to think I have an issue like a short of the heater circuit, and the ECM is compensating by dumping fuel when it should be cutting fuel. Testing...

Nope, use the same fuel from Safeway or the Pilot station. That ethanol switch is an expensive bugger. We don't have to much ethanol in the NW.

I changed the intake gaskets and vacuum pressure is 25in hg at idleand drop down at higher rpms. So I am leaning against vacuum leak, my fuel trims are all over the place.

2000 3.0l flex fuel engine is throwing P0171 and P0174. Replaced MAF, Egr Valve, fuel filter, fuel pump, pov valve, o2 sensor S2B1, fuel injectors and have done a smoke test and still getting the codes and it runs worse everyday. STFT is at around 30 after it warms up a bit at idle I have bank 2...