Disclaimer: where you live disabling TPMS might be totally illegal or depending on what year your car were made! Read up on local regulations before proceeding.

Also you will need to read and write to one of your cars modules, this is not completely risk free and you might brick your car! You do this at your own risk.

You will need:
A laptop or simular
OBD2 tool
FORscan with a extended licens

Why: In Sweden TPMS on a car from 04 is totally optional and completely legal to disable. It will even pass a MOT with the warning light on or flashing. I have aftermarket rims without sensors and the TPMS module had lost the old senor ID's so the light was always on and annoying the crap out of me!

How: Searching this forum and googling the only solution i found was covering the light. I was not pleased with that solution so i found another way! Depending on year/software etc this might not work for you. (my RX8 is a 04/05 north american 6speed manual high power)

I downloaded FORscan, registered on their forum for an extended license. At first i tried to write new sensor id's to the TPM module but writing to this module was not possible using my standard obd2 tool. Next step was trying the IC module (instrument cluster).
After a few tries turning bits off one at the time i found the bit telling the IC that the car has TPMS. Setting this bit to zero turned TPMS off, no CEL, light or beeps

Do it like this: Download and install FORscan, get a extended licens (there is guides on how to do this, use the search funktion or something :P) connect your obd tool to your car and computer, i used a usb one but bluetooth should also work i guess. Start forscan and connect to your car. Click on the chipset looking icon, chose the IC module (as built data) and press the litle play button. And now do as my picture show

Use your imba math skills or windows calculator at programmer setting to calculate your new byte value and checksum.

When writing data to one of your modules its always a smart idea to have your car and laptop connected to external powersupplys since a powerdrop during writing is rarely a good thing.

Hope this will help someone and that my English make sense!



Instructions

 

wow, this is fantastic. can't believe more folks didn't thank you for taking the time to figure out and share!!

 

suzukimogge I know this was posted 4 years ago but wondering if you can help a fellow out!

My configuration (existing) is different from yours. Mine is 720-01-01 78D0 A200 0013
What would my last two digits need to be updated to? I don't speak binary.

 

Updating the thread for future searchers. I found that Forscan calculates the checksum automatically, so once you change "D0" to "50" in the first editable block, click write. It pops up a warning, ignore and click through it and then the checksum will automatically be updated when it reloads.

 

Just wanted to say THANK YOU!! I've been dealing with TPMS flashing when it drops below 65F regardless of new sensors or not. With the new wheels I bought no matter how many times I try relearning TPMS, bought new TPMS, they never register even though batteries are fine. I used FORscan and disabled TPMS and sssssoooo happy that stupid flashing light is off now.

 

How did you decipher that this was the right bit to change?

I'm familiar with using VCDS on our VW to change all kinds of programming in the CAN-Bus system, but VCDS has easy to use check boxes and drop down options.

What's the safest way to explore other options hiding within the RX-8 CAN-Bus?

 

I have the same question. I am hesitant to change some random bit in my PCM/ECU because someone on the internet told me it was okay... key in the ignition, turn the key, "and its gone..."