I have a 2012 GL350 with 88,000 miles with replacement tires 2 years old. I’ve been noticing the air pressure in my left front tire seems to deflate 5 psi per month for the last 6 months. I took my GL to Big O Tires to check for an air leak when I rotated my tires last month but it appeared everything was ok. Today I was driving home on the freeway, when I got a message stating to check the air pressure on my left front tire. I clicked to the tire sensor display and it was red instead of the normal white lettering and drove to a gas station for air. I put air into the tire and reset the display and it seemed to be a fix for today.
is it possible I’m having an issue with the tire monitoring system sensor? MB part# 000 905 72 00
if this is a possible fix, do I need to purchase an OEM TPMS or is there a more reasonably price part available?
Thanks

 

1. Fix the leak in your left front tire. TPMS is working as advertised.


2. your TPMS sensors are throwing junk at you and there is no fix other than
a) replacing your dying sensors or
b) getting rid of them entirely.

Yours being a 2012 by law you “need” TPMS. i just programmed mine out of my 2007 and check tire pressures regularly because it’s ****ing stupid.

IIRC you’ll need a 443 MHz sensor to be able to talk to your tpms receiver…but anyone please back me up on that.

if you decode your vin on the vin Kiev . Ru site it’ll tell you what frequency sensor to get. And Amazon or eeuroparts has them t about $50 a wheel.

Would also be nice to understand the pressures you’re seeing at which tpms triggers these warnings to determine if it’s just a persistent leak or a tpms fault.

 

I am running 44 PSI on all tires because I have had inside tire wear on all previous tires. The font left tire got done to 38 PSI and then threw the red “Check Air Pressure” notification. The left rear tire was at 39 PSI and the right front and right rear were at 44 PSI.
I am staying with the TPMS sensor system, so what would be the best replacement sensor for my 2012 GL350? If there is a less expensive replacement part that would be appropriated since the OEM sensor is $110 each.
Thanks for the help!

 

I found America’s tires has these, so can I just replace (1) or do all sensors have to be the same brand?
BH SENSTPMS SENSORBHS UV4040 TQ40 RED 433 INTLSNS 6YR/72K
Item #80963
$60.00/ea

 

It is certainly possible you are having a problem with the TPMS system. Most likely is a wheel sensor … each sensor contains a battery which of course has a limited life. They do not recharge. In 2021 you’re past the expected life of a 2012 installed sensor.

Yes, you can use aftermarket sensors … the only requirement being they are the specified radio frequency. I think it’s a pretty good idea to keep them all the same age and it’s probably most convenient to replace all four when fitting new tires.