2013 Sienna P0051 & P0031

Thank you DaveJM, I finally got a few minutes yesterday to go over the troubleshooting guide that I found on http://www.tsienna.net. As you DaveJM said it was not the sensors. I tested the continuity of the wires and it all was fine. I did not go over all the troubleshooting steps because I had to return to work but somehow when I put things back together everything was back to normal. No more codes in the system, no warning lights on. So I believe there was a bad connection somewhere and the fact that I messed around with these wires restored the connection which means it could well come back anytime. I have driven the car for a day so far and things are normal.

Fantastic news, yes, sometimes re-seating wiring connectors or disturbing them can restore continuity that has been lost. Fingers crossed the light stays off and the vehicle keeps running well!