Tire pressures indicator
 

Cool feature, but my 07 alerted me today I was low 4 psi in one tire. I got home and whipped out my tire gauge and all tires are normal. I keep 32 in the front and 35 in the back. Yes... a little different than manufacture recommendation. Also the tire pressure monitor doesn't seem to read accurately. Do the tire sensors need replacing?

I bet the batteries need replacing

I'm told 3-5 years. Wife's VW went bad at 8-9 years.

Got super hyper sensitive. Then would drop reading. Very annoying.

I had a brand new '07 Cayman S that did the same thing. (back in 2008)
I took it to the dealer and they told me my pressure gauge was wrong and the "car was right".
After waiting a few seconds for him to start laughing (he didn't) I told him that was ridiculous.
He offered to replace the sensors at my expense and I declined.

The only way I could reset the system was to overinflate all 4 tires to 5+ lbs over recommended and drop them back down to the correct pressure.

It happened a total of 3-4 times in the 4 years I had the car.
The ONLY annoying thing I can remember about my time with it.

Good luck.

If there is one thing that owners find annoying, it is the TPMS system. More often than not, they are inaccurate, expensive to maintain, and time consuming. Interestingly, the most common question we get about Porsche's version is, "Can you turn it off?" The answer to that is yes, but we won't do it, or tell you how to do it, for liability reasons (it is a federally mandated safety system).

^^ this ^^

If at any point it is low (> 4psi) and the indicator comes on, you have to overinflate the tire for the indicator to reset off. Stupid but the only way. Just inflating to recommended pressure will keep the light on.

If you are getting readings on your dash, the sensors are working. They last anywhere from 4-6 yrs of continuous use. Generally good to change them when you get new tires, if the tire purchase falls in the 4 yr range and you always leave the tires on. They evidently have a sleep mode if the tire is removed (like swapping snows, etc) or it doesn't move for a period of time. I have a set of sensors on my snow tires that are quite old but still work fine.

I over inflated to 40 psi in the back and 35 in the front. The alert cleared. Now to deflate a little at a time to find the sweet spot.

Just drop to your desired "spot" and the car will learn the level you select the next time you drive more than 10-15 miles.

TPMS frequency..?
 

By any chance someone knows which frequency does the TPMS sensors use?
I am trying to buy two for the front wheels (getting new tires) but was not aware that there are different frequencies.. :-(
Thank you in advance!

My '03 doesn't have TPMS. It's a nice feature, but obviously comes at an expense.

My '07 BMW 328i TPMS sensors (original) are still working at 135000 miles. I expect they'll need replacement one of these days... the system definitely saved me from wasting a run-flat once. One morning, gave me an alert first thing, that wasn't there the night before. I got about 1/4 mile from home when the light came on, went home, pumped it to 40, then drove 1mi. to tire shop for a good repair.

Depends on the year. My 2008 requires a 433 MHz. Think with the 987.2 they went with a lower MHz. Check Pelican, they will have the proper one listed for your year.

I am sorry
 

but forgot to mention that my car it's an '07 CS...
do you think the old TPMS would have the MHz frequency stamped on it?

Maybe, but it's very likely in the parts system, which is a lot easier to access than something requiring removing a tire to view.

Your dealer can look it up, your independent mechanic can probably look it up, you can look it up once you download the parts system file from Porsche.com

Your 07 will be 433.

This is correct you can find 4 433 MHz sensors on eBay for about the same cost as 1 at the dealer.

Thank you guys!
 

I found two sensors with the 433MHz for about $64 including shipping

https://tpms247.com/collections/2007-porsche-cayman

Anyone try these aftermarket kits?

https://www.crutchfield.com/p_974TPMS100/PAPAGO-TPMS100US.html?tp=66603&awkw=205222097785&awat=pla &awnw=g&awcr=104893298305&awdv=c&awug=9012056