I'm wondering if my problem is low batteries in the sensors. I'm getting what appear to be accurate readings, but the orange warning light is on. Then at other times I don't have any readings. See the attached photos as examples.

 

 

 

Sounds like batteries. Will work when you first get in and start the car, but then the weak battery stops communicating and you get the error. My Infiniti exhibited the exact same behavior when the batteries were dying.

 

Thanks. I assumed it was a battery issue. They have been in there for about five years.

 

Had the same issue recently. Got these: https://tpms247.com/collections/2011-porsche-911

Had them swapped out with the originals while having some curb rash repaired. Once installed, go through usual reset procedure, they'll be up and working after a few miles. A lot less than you would pay for OEM, and they work great.