There are two different types of automatic tire pressure sensors (AFAIK).
One, the ‘older’ type has a module in the valve stem that senses tire pressure and reports it via RFID.
The other, senses RPM at each wheel and since a lower pressure tire would spin faster, will report that it is likely under pressure.
A couple of questions.
What type of sensor would a 2016 Subaru outback have?
At what pressure differential would it start reporting a low pressure warning (2lbs, 5 10?)
Short story long - My Wire has said car. She got a leek in her right front tire, took it to the place that she bought the tires from and they ‘fixed’ it. It seems to still have a small leak as my gage reads it goes down about 1lb a day. Yes we will have it fixed again. (with a small dose of ire, but people make mistakes)
What is odd, is that I have put the tires to the specified air pressure rating located on the sticker on the inside of the driver door, but the light remains on. My Wife drove the car 15 miles today and the warning light is still on.
Also, I’ve noticed that the valve stem is a rubber one now, and not the steel ones that are standard on all of the rest of the tires. I wonder if in replacing the valve stem, the TPMS was messed up.
RE: the sensor light staying on–if the system is like my Mazda, you have to reset the system whenever you take a tire off. There should be instructions in the owners manual.
I have a OBD2 check engine sensor. It did not read that any codes had gone off. And would not clear the tire pressure warning light. I’ll dive into the car manual when my Wife gets home, but doubt it will be much help. Thanks for your reply.
Your scanner likely only accesses the engine control module but the low pressure code would be stored in a different module. Maybe ABS or Body Control.
The manual says there is a TPMS in each wheel. The spare was low so I took it up to it’s remanded 60 psi. Suspect that when the leek was fixed that the sensor was messed up.
The manual is some 400 pages. All of the books together are 2"s thick. I’ve checked everything I could find related to tire/tire pressure. Thanks though for responding.