A few things.
1. You sometimes have to drive the car for a while until the TPMS resets.
2. If the inside of the door says 39PSI, then do it. It seems high, but 32 pounds was the standard way back when it was all about a cushy ride. The sticker on my R56 calls for 38 pounds all around, and that's where I keep them. Welcome to the 21st century.
3. It is my understanding that the tire pressure warning sensors are passive, so there are no batteries.
My advice is to air them up to the 39 pounds cold on the door sticker, and drive the car and see if the TPMS resets on its own.
CD
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Okay, I called my buddy who knows more about cars than I ever will, and he told me that TPMS sensors are NOT passive. They have batteries, but they last a long, long time. He is a Porsche technician, so he knows stuff.
So, I still think you should air the tires up to the pressure on the stickers, and he agrees, and see if the TPMS system resets, before spending time and money on repairs you may not need. He said that 32 PSI would easily trigger a TPMS warning if the sticker calls for 39 PSI. -
Crashton Club Coordinator
I believe your Wife's R57 does have sensors with batteries. What year is her car? I doubt a battery had died, but could be. Some tire shops can read a code & tell you witch one. Like CD says it can take a while for the light to go off once you reset. Also if your Wife's car has runflats set the pressure to what the label says.
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DneprDave Well-Known MemberSupporting Member
You have to manually reset the TPMS after adding air to turn off the warning light. Your owner's manual tells you how.
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Dave.0 Helix & RMW PoweredLifetime Supporter