Blinking TPMS Light
 

A few weeks ago, right after I got my spark issue sorted out, I was driving back to college on the interstate. I was doing 75-80, and my TPMS light started flashing. I got off a couple exits later, went away once my speed dropped below 60. Pressures were fine. Got back on the interstate, started flashing again and continued to do so for the next 3 hours until I got off at my destination and my speed dropped below 60 again. It stays off at speeds below 60.

I took it to firestone in Tupelo a few days later, and they of course told me to go to Mazda because they couldn't read my sensors. Went to Mazda and they got a perfect reading off all my sensors. I told the tech what was happening, and he said one of the sensors was probably separating and only separated enough at high speeds to cause the light, and worked fine the rest of the time. He said I would just have to wait until the sensor completely failed to know which one it is. I've already driven 1000 miles with no improvement.

Any ideas on how to know which one it is, or how to get it to fail quicker? I do a lot of highway driving and this light is really getting on my nerves.

TIA

Thanks to the generic system of the TPMS modules, there really is no way to know "which one" is failing. Even when reading the data back from the ECU, the TPMS data doesn't have any unique identity to it that will help you say "oh ok that psi belongs to that tire". That is why they need it to fail before they can tell which one it is (as the failure will be seen at the sensor instead of reported generically by the controller)

well damn, that's what I figured. I guess I'll just have to deal with it until it finally fails completely