Just tonight my tire pressure monitor light lit up on the dashboard. All tires, incl the spare, are fine - perfect (and identical!!) pressure in all. Thus, I believe it is one (or several) of the TPMS sensors that is at fault.It's a 2009 RX350 built in 2008, only 47.5K miles, so the sensors are close to seven-eight years old. Does that sound correct, or is it likely that I am facing another issue such as failure of the receiving unit in the car? How do I check one or the other (without changing the sensors or the receiving unit)?
A Lexus tech had told me about 18 months ago ago (when I changed my tires) that the TPMS sensor batteries were estimated to have a life of ten years. But I am in South Florida, so maybe the heat has shortened their life? Does anyone have experinece in that matter/
Thanks!!

 

As someone else mentined recently, make sure the TPMS "main/2nd" switch in the passenger footwell didn't get bumped to the "2nd" position.

I had a sensor go out around the six year mark. The rest are still fine at nine years now. (Knock on wood!)

 

Thanks for the suggestion - I will check it.
How did you identify which sensor went out and which were good?

 

Was under warranty at the time, dealer took care of it.

 

I'll have to check whether it is covered under the 'platinum' Lexus extended warranty. I doubt it, but easy to find out.
No, the switch is set to 'main' - no change - but the light mysteriously went out this evening. All other things were equal... I assume it will be back.
Thanks for your comments!
Pau

 

They have a scan tool which they use to diagnose each tpms sensor.

 

Good to know. TKU!
I hope I will not have to ask them to use it.