Aaargh!!! TPMS Registration!

You can use Techstream to blank out the tire and turn out the light. But unless you can get the code from the wrecked Prius, AFAIK you gotta deflate and read. do not know if a Denso code setter can read the code, but Techstream you need to feed it the code.

 

I had a sensor I didn't know the ID of so I went to a local tire store and they had a tool that could read the ID and display it without having to dismount the tire. You could call some in your area and see if they have such a tool and would be willing to take 5 minutes to use it on your new sensor.

 

I know nothing about tire sensors, so I'm curious, why would you have to reregister an existing sensor? All you did was move it from one wheel to another wheel and put it back on the car. How does the car know it was moved to a different wheel?

 

Just to follow this thought, it would be really funny if the problem was actually low tire pressure.

 

Swapping the old sensor in should resolve this then. You can test this by putting the old wheel with sensor in the hatch for a while, the light should go off. Just make sure the tire's got pressure.

You do have the old wheel and sensor?

 

Sorry, I misread your statement thinking you were talking about the original wheel, so I get it now. I'm surprised the installer didn't suggest keeping the original sensor or ask if you needed the serial number for the replacement, I would have.

 

Did you see my thread on Managing TPMS with Techstream over on Gen2 Maintenance? I tried Code 0000000 and that seemed to turn light off for about 2 weeks, then it came on again. I assume another sensor went bad on me (old), but I will check. The other "cheat" approach might be to give it the code of a working sensor.

How do you know which tire to reset the code?
Unless you know which tire, AFAIK you have to go around and reduce pressure and watch the screen to see which tire is which. It does take a few minutes for the data to update and the Techstream does not show immediate reaction to pressure changes and code changing. Data needs to refresh.

As far as theory, I did read there is some privacy concern with TPMS as in theory a roadside reader could track vehicles. That implies the ID code is transmitted.

 

I'd just live with the light; that's taking cargo cult to new heights.

 

That's one approach but I am trying to play with it with Techstream just to see what hacks are possible. Also I am curious to see how long each sensors last.

 

OK...if that battery is TMPS dead I think you get NA reading...so the implication is the old TPMS still reading. I was also wondering if there is some way to pressure up the old TPMS to fake out the reading.

 

You will have to pull that SOB serial number out from that wheel, there's no other way lol... sorry that this happened. I think you can go back to the tire shop and have the guy deflate the tire and squeeze the tire down for you to write the serial number down.

 

I am sorry the "zero" technique did not work ...I will try to get on Techstream soon to try it again on my Gen2 to see what is going on.