A few years ago I installed an external TPMS on my vehicles tires (2008 Tacoma) to pin point the exact tire(s) that needed air, etc. because of my vehicles old factory TPMS system with the dreaded symbol.
Which is helpful to some extent though not very accurate or specific on which tire(s) to check that's causing this light to come on my dashboard.
Though I have been very happy and pleased with my current external TPMS set up, no complaints. Even installed one of these on my daughters Tacoma as well.
You can read about it here.....(my initial post starts at #4)
Is there a way to read the exact pressures with the factory TPMS sensors? (This is for an 09)
www.tacomaworld.com