TPMS sensor battery voltage reading...
Thread Starter
AudiWorld Senior Member
Joined: Jul 2001
Posts: 1,937
Likes: 42
From: Kansas City
TPMS sensor battery voltage reading...
today I took apart a TPMS sensor to check the condition of the battery and see if I need to put in new batteries. I am changing wheels and I don't want to buy the new valve stems required (at $22 ea) and transfer the sensors if they are at the end of their battery life. I have an 04 and by everything I read the battery life is 5 years so I expected the 3.5V baterry to give a low reading. Instead, I got a reading of 3.65V which I would expect of a new one. Maybe the sensors have been changed before I got the car 6K ago.
Anyway, I soldered the connections back together and will seal the unit up and install the sensors and see if everything works. The point of this post is to say that the sensors can be disassembled and the battery replaced if needed.
Anyway, I soldered the connections back together and will seal the unit up and install the sensors and see if everything works. The point of this post is to say that the sensors can be disassembled and the battery replaced if needed.
AudiWorld Member
Joined: Jul 2001
Posts: 537
Likes: 6
today I took apart a TPMS sensor to check the condition of the battery and see if I need to put in new batteries. I am changing wheels and I don't want to buy the new valve stems required (at $22 ea) and transfer the sensors if they are at the end of their battery life. I have an 04 and by everything I read the battery life is 5 years so I expected the 3.5V baterry to give a low reading. Instead, I got a reading of 3.65V which I would expect of a new one. Maybe the sensors have been changed before I got the car 6K ago.
Anyway, I soldered the connections back together and will seal the unit up and install the sensors and see if everything works. The point of this post is to say that the sensors can be disassembled and the battery replaced if needed.
Anyway, I soldered the connections back together and will seal the unit up and install the sensors and see if everything works. The point of this post is to say that the sensors can be disassembled and the battery replaced if needed.
AudiWorld Senior Member
Joined: Apr 2000
Posts: 812
Likes: 1
From: North Scottsdale
My '06 SWB sport with 52K miles gives me a tire pressure monitor failure message almost every time I drive it and gives me the little flat tire icon... then it stars to work again half way through the drive... is it telling me the batteries in the sensors are going south??
AudiWorld Member
Joined: Jul 2001
Posts: 537
Likes: 6
Yes. My car only does this when it is cold. Last winter it happened almost every day, then nothing for 9 months. I fully expect to hear this nonsense in the next few weeks.
AudiWorld Super User
Joined: Aug 2002
Posts: 4,918
Likes: 7
From: Warwickshire
It is possibly as the batteries are cold the voltage is too low to operate the sensor properly.
Do you know if tyre compound has any detrimental effect on the sensors ability to communicate with the monitoring system?
Do you know if tyre compound has any detrimental effect on the sensors ability to communicate with the monitoring system?
Trending Topics
AudiWorld Super User
Joined: Jan 2006
Posts: 6,310
Likes: 123
From: Las Vegas, Nevada USA
Oh for the want of only $200 for a Kodak which work perfectly fine for me. My cam,era still works but nothing other than basic photos since I need to see the LCD display to change any settings.
AudiWorld Stories
Bringing Audi to Life for Audi Fans
Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer
Brett Foote
10 Audi Features & Options We Miss the Most!
Joe Kucinski
Audi Recreates Crazy-Looking Speed Record Breaker From 1935
Verdad Gallardo
Coachbuilder Recreates the 1995 Audi TTS Concept
Verdad Gallardo
Every Audi V10 Car Ranked!
Joe Kucinski
9 Audi Designs That Aged Like Fine Wine
Verdad Gallardo
2026 Audi Q5 Buyer's Guide (Every Model Explained)
Brett Foote
Ranking Every Current Audi 'S' Model From Worst to First!
Joe Kucinski
10 Best Audis That are FINALLY LEGAL to Import to the U.S.!
Joe Kucinski
AudiWorld Super User
Joined: Jan 2010
Posts: 2,218
Likes: 23
From: Michigan
Yes, please post a how to on replacing the battery. On occasion I get the TPMS fault error and I just cycle the igniton or re-initialize the wheels and it works perfect. I hate the TPMS. lol
AudiWorld Junior Member
Joined: Oct 2010
Posts: 49
Likes: 1
I just had my dealer replace 3 of the sensors on my 2004 A8L. Fortunately they were covered by the dealer under warranty as I had just recently purhcased the car from them.
Did you happen to take any pictures of the disassembled sensor showing the battery? Do you have any information to provide on the part number and style of the 3.5 volt lithium battery used in the sensor? What is required to disassemble the sensor to replace the battery? You mentioned that the batteries are soldered in place so I am assuming that the cells have solder tabs on them.
Did you happen to take any pictures of the disassembled sensor showing the battery? Do you have any information to provide on the part number and style of the 3.5 volt lithium battery used in the sensor? What is required to disassemble the sensor to replace the battery? You mentioned that the batteries are soldered in place so I am assuming that the cells have solder tabs on them.
Thread
Thread Starter
Forum
Replies
Last Post
garysaunders85
A8 / S8 (D3 Platform) Discussion
3
Feb 11, 2019 09:04 PM
volvopentaman
A8 / S8 (D3 Platform) Discussion
12
Sep 24, 2018 01:23 AM
