upstream a f sensor
Ok It was my understanding that bank 1 was drivers side. My bad. after replacing the sensor twice, then putting the old one in and replacing passenger side, p0031 code went away. lesson learned.
upstream sensor
I think I will try the other one I bought to rule out bad sensor. Not sure how to check voltage. I make things up as I go. Thanks for the recommendation.
a/f sensors
I got two from ebay, 84.00 each. Genuine Denso, however I think the one I replaced on drivers side is bad. p0031 code, Zero point calibration won't clear.
success
Finally got the drivers side off and replaced. Started out an adventure, ended up a quest. ( I'm Really stubborn). Now P 0031 code is showing up.
Did a search, no joy. How in the world does one get these off? I tried from the top, bottom, and wheel well. Downstream 02 sensors were easy. 2004 sr5 v6.
Rattle
After much anguish, I checked the cross members on the roof rack. One was loose, making noise only on bumpy roads. I only wish I had checked this first.