P0171 and P0174 - Stabilitrak...only under certain conditions.

[Jimxms]

bank2 looks off, for the backpressure test you would need to either buy a tool or make one
it would just take say a pipe fitting that fits in the 02 bung, hose and a low pressure psi gauge
I think the tool just has nozzle fitting that you stick in the forward 02 sensor bung
looks like harbor freight sells a tool for $35

https://www.harborfreight.com/engine-and-transmission-oil-pressure-test-kit-64872.html?event_id=183642&utm_source=google&utm_medium=cpc&utm_campaign=17890472041&campaignid=17890472041&utm_content=140972256953&adsetid=140972256953&product=64872&store=3091&gad_source=1&gclid=Cj0KCQjw3bm3BhDJARIsAKnHoVUH8A5CTuf4pWpfDBmBRKSj3rQLn3afg92-vCsAbmL2BUSu6s4P-o0aAkhhEALw_wcB

if I start with B2, is that passenger side do you know?

 

[Doubeleive]

if I start with B2, is that passenger side do you know?

bank1 is drivers side, bank2 is passenger side
bank 1 sensor 1 is the sensor before the cat, bank 1 sensor 2 is after the cat and so on
for backpressure test do it thru sensor 1 bung