Should I replace my 2yr old TPMS when changing tires?

My observation is to believe the TPMS, lol.

 

There can be glitches:

A year or two back the TPMS light came on, on our ‘10, tire pressures were fine, and I figured one or more of them had battery failure.

About a week later light went off, nothing untoward since.

similar happened just a few years after purchase (new): light came on when we were on vacation. Pulled into a gas station, all pressures fine, bumped the pressures 3~4 pounds, light went out. I set them all to usual pressures, cold, a few days later, light did not return.

 

As I understand it, TPMs is only mandatory in US and perhaps some other clone countries?

Anyhow, the general sensor concept is sound - if you don’t have to replace tyres every winter. Then it becomes an expense, since the G3 does not auto learn new IDs, as modern (2018 for Toyota..) models do.

You may clone any IDs easily and cheaply with i-venu/thinkcar app and S3 sensors. You may tape over the light. You may replace the batteries. You may cut the warning light via above mentioned loop.

 

Indeed, this TPMs concept is very much non-fool-proof. It’s an old-way communication tech.

The light tends to go on due to;

1. Battery saving / Sleeping TPMs that only wake above some unknown tire rotation threshold.

2. Temperature changes to below -2°C

3. General confusion in the ECU/system, ie delay in picking up IDs and assuming ID1-4 is the same within error threshold (20 mins) (validated for me via obd reading, two and some times three tires show identical pressure - with two decimal points. Unlikely correct…).

The plug-in G3 I purchased autumn 2025 had one sensor actually missing/broken off. The others were Toyota OE from the factory and still works on both sets of tires, thirteen years later.

G2 does not have TPMs, atleast not in Europe.