I am about to put new tires on my 2017 991.2 Carrera, which I purchased new a little over five years ago. Should I be thinking about replacing the TPMS sensors at the same time?

Or put another one, for 991.1 owners (and I know that your sensors are slightly different), what's the longest life you've seen?

 

FWIW, the sensors in my 992.7 TTS lasted nearly 10 years. The battery in one was dead, other three still working. Changed them out when I changed tires. Discount Tire did a good job, reasonable.

 

I’m at 8 years on the S, no problems

 

The ones in my 2013 Lexus RX450h started failing this year. Probably bought the car in fall 2012 so roughly 9 years.

 

Up to ten years. No need to replace them on a 2017 yet, maybe do that on your next set.

 

I have a 3 year old winter set where 1 of 4 of the sensors failed. The car was unable to register pressure offer the change.

I had the 1 tps, replaced and on 2 drives the car still cannot pick up the wheels (using the switch winter - to summer-to-winter method in the tire fill menu).

I wonder if I pull the fuse for the tpms will the car’s module reset? Hoping someone can comment ...I don’t want to visit the dealer for the module reset and I don’t yet have a diagnostic tool.

 

If they go the distance 10 to 12 yrs on average.... 15 yrs is not unheard of ...colder climates tend to not make them last as long .... They can fail at anytime unfortunately and why I hate the bloody things and try to avoid them at all costs and why when purchasing my 997 one of the reasons I purchased a 2006 model (last year TPMS as an option)

 

Sounds like the antenna is hoopajooped. If the TPMS sensor is the right frequency, the car will find them and assign them each time you drive -- due to this design, there's no need to pair TPMS sensors to the car, nor is there a reason to reset the module, since it effectively gets reset every time the car goes to deep sleep (off for 1.5-2 hours).

Make sure you put a 433mhz sensor in if you're in the US. Somewhere in ROW they use 315mhz, and they are not interchangeable. There's also mention that despite being 433mhz, the 991.1 and 991.2 sensors are also not interchangeable, though I cannot confirm this. Best to call a dealer.

 

When they are more than 6 years old and I’m getting new tires, the sensors are replaced. It eliminates one thing that will eventually fail, inconveniently.

 

Wireless computer mice come to mind, for some reason...

 

The 991.1 and 991.2 sensors are definitely NOT interchangeable. When I bought my snow tires and wheels five years ago, TireRack shipped them with the 991.1 sensors, which my 991.2 was not able to read. After switching to the newer sensors, the TPMS worked perfectly.

 

My local tire guy down the street has a little portable handheld receiver that can read all the data outputs on the TPMS sensors simply by waving it next to the valve stem. It tells the battery life in each sensor, the reading, manufacturer number, etc. One of them indicated was at 17% battery life remaining once, and he said he had a replacement in stock. I told him to do it, no problem… $59. Car never knew the difference

Sometimes the TPMS sensors need to be activated and programmed, and the TPMS tool can do that

Newer sensors transmit more data instead of just tire pressure and temperature, They include acceleration, run-flat mileage, load detection, tread depth and storage of tire data, etc. This likely requires a better battery and processor. This data can be used by the PCM to make real-time adjustments on suspension, powertrain, and other vehicle characteristics.

 

Very interesting! They are both supposedly 433mhz so I'm not sure what the difference in protocol is over such a narrow year range. This was enough for me to go check part numbers/dealer listings and sure enough, there's a break in fitment lists at 2017.

Numerous users here have said the 991.1 and 991.2 sensors are different, see above for the latest. This can also be confirmed by parts interchange searches on dealer websites, like suncoast, which show a fitment break at 2017.

I recall reading that the 991 uses direct, high-line sensors with a 4 antenna (or 3 plus some software tricks) system, and the system behaviour more or less confirms this design as it removes the need for the sensors to be "programmed" or "activated" -- at worst, you need to select the tire size in your TPMS menu in the car to reset the system, as the OP already has done. This will begin polling for the sensors, which need to experience enough centrifugal (or centripetal?) force to turn on, which is why the system doesn't measure below 15mph.

Programming/activating TPMS sensors are done for low line systems, where the car does not have an individual transponder/antenna for each wheel, so you must teach the car which TPMS sensor is on which corner of the vehicle. This is what TPMS-capable scan tools allow you to do, but you can also do this on some cars just using a neodymium magnet.

 

^^ This is fact! Just went thru this with my 991.1 TTS. Both are 433 mhz but Porsche changed the protocol in 2017 for the 991.2.

 

17 got new rims months ago, just got new sensors, one less problem to deal with..synched right up in minutes..think it was $134..Discount Tire installed at N/C, old ones went with the original rims..