[pmcmtnbkr]

I took a gamble on some inexpensive tpms sensors for my winter set up on my 2015 m235i. These work great and are very reasonable. the only problem i had was one valve core was not screwed in all the way from the factory. This usual wouldnt be an issue when i replaced valves i remove the cores to make air flow better for seating the tire bead. I didnt do this when i installed them this time and it bit me in the butt
https://www.ebay.com/itm/For-BWM-I3-....m46890.l49292

[Jcoop901]

Does the car automatically detect them? Do they need to be programmed or coded?

[pmcmtnbkr]

Originally Posted by Jcoop901

Does the car automatically detect them? Do they need to be programmed or coded?

through the idrive menu you do a reset. with the car running and parked start the reset once the reset is activated you drive the car around for a few minutes and as the tpms are register.

[230iZTR]

I think at least one of the brand new TPMS sensors I just put in must be bad. What's the easiest way to figure out which one isn't working? I took it to the dealer and they quoted me to replace all 4 but that doesn't seem like it should be the go-to fix.

[ggggbmw]

The easiest way to test TPMS sensors is with a TPMS tool. These activate the sensors and read them. If you're a tool guy, this is an easy buy.

They start in the $100 range for a simple reader that only checks the tire sensor. Better readers are in the $225 range. The better readers also interact with the OBD port on your car to read and write the TPMS values into the car TPMS computer.

Our BMW's are nice enough to reset with a simple menu choice. But if you have a Japanese car, doing a summer/winter wheel swap is impossible without a tool like this to tell the computer it has new sensors to read. You either pay the dealer or tire shop to do it, or you buy a tool like this. Pays for itself in a couple years.

I have an Autel MaxiTPMS TS501, and use it several times a year. Works great.

[dradernh]

Originally Posted by ggggbmw

if you have a Japanese car, doing a summer/winter wheel swap is impossible without a tool like this to tell the computer it has new sensors to read.

This is why when the wife asked for a hatchback I pointed her to the Mazda 3: it doesn't use TPMS sensors.

Her three-season tires go on day after tomorrow and just require the press of a button on her dash after the pressures are set. It's too easy.

[pmcmtnbkr]

Originally Posted by dradernh

This is why when the wife asked for a hatchback I pointed her to the Mazda 3: it doesn't use TPMS sensors.

Not sure how that can be
TREAD Act. The Act mandated the use of a suitable TPMS technology in all light motor vehicles (under 10,000 pounds), to help alert drivers of under-inflation events. This act affects all light motor vehicles sold after September 1, 2007. Phase-in started in October 2005 at 20%, and reached 100% for models produced after September 2007. In the United States, as of 2008 and the European Union, as of November 1, 2012, all new passenger car models (M1) released must be equipped with a TPMS. From November 1, 2014, all new passenger cars sold in the European Union must be equipped with a TPMS. For N1 vehicles, TPMS are not mandatory, but if a TPMS is fitted, it must comply with the regulation.

[dradernh]

https://www.tirerack.com/tires/tiret....jsp?techid=44

Originally Posted by pmcmtnbkr

Not sure how that can be
TREAD Act. The Act mandated the use of a suitable TPMS technology in all light motor vehicles

Mazda's procedure shown below; genius, right?

These links provide some specific information re how it works:

https://www.reddit.com/r/mazda3/comm...ssure_warning/
https://www.tirerack.com/tires/tiret....jsp?techid=44
https://www.tirereview.com/indirect-tpms-imports/

I'll continue relying upon regular tire pressure checks with a quality TP gauge to ensure my pressures are where I want them to be. I think the TPMS systems are most useful for people that never check their tires and in a case where a tire is losing pressure at a rate where the owner is going to need to deal with the problem very soon.

[randmness]

I think most Mazdas (up until a few years ago) used an ABS-based TPMS (ie no TPMS sensors.) My 16 Mazda ND didnt have them. My 19 did though.

[pmcmtnbkr]

Originally Posted by randmness

I think most Mazdas (up until a few years ago) used an ABS-based TPMS (ie no TPMS sensors.) My 16 Mazda ND didnt have them. My 19 did though.

interesting work around on Mazdas part

[ggggbmw]

My wife's 2019 VW Golf Sportwagon uses a similar no-sensor, wheel rotation based TPMS system. Early F22's in different markets (including Canada, iirc) also used a rotation based design. It's more common than you might think, especially in down market cars.

I actually like the TPMS system with sensors. I find it very reassuring to be able to see pressures and temps on each wheel. (Had to code it on in my 2014.) And if you have issues, it's easy to see which wheel it is. And I like the push-button reset. The system on my Altima drove me nuts. Reliable enough, but no info except a trouble light, and needed special tool for reset. And no adaptive limits like our BMW's have. Had a tire garage chasing a bad sensor for hours when they only put in 26psi instead of 30psi. (They weren't that bright, and I finally figured it out for them, but still, the lack of info made it hard.)

I like the TPMS display so much, I have it programmed as button 7 on my iDrive quick buttons. And it's my default display when I'm tracking the car. VERY helpful for monitoring pressures and temps.