Not to necro a thread, but I searched all over the place and this is the only related one I can find. Same thing happened to me yesterday during our lovely Polar vortex up in WI and well everywhere.
New to us 2015 4runner limited with 31,000 miles (we love it and I'm so glad I was able to talk the wife out of a highlander or blech van...) She still loves driving my 14 gmc sierra so that helped
We have a heated garage but keep it at 40 when the temps get super super cold, but it must have been enough to set things off because a couple minutes after driving in the -20 temps both lights came on and have stayed on. Checked at the local toyota dealer to pull codes and they said it's more than the gas cap one but would have to pay the inspection cost to have them dive into it.
Bringing it back to the lexus dealer who I bought it from recently to have them look at it Monday and find out what could be going on. I'm hoping an ECU reflash as discussed here will solve it and keep it from coming back.
Anyone else have the same problem in this latest cold stretch?
Thanks!