J1.2 TPMS

[Boss Hogg]

So Porsche decided change a perfectly usable system (I swap between 3 sets of wheels on my J1 Taycan, it just works), rather than spend the same resources fixing any known issues (like PCM getting stuck on the "PORSCHE" boot splashscreen, or app reporting car is in privacy mode even if it isn't, etc, etc). Granted, screwing up things that work is much easier than fixing things, but wouldn't it be even easier to just do neither?

I've not confirmed the ECU needs TPMS sensor programming, it is my theory but will find out soon, I'll report back

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[Scandinavian]

Does anybody know the technology that the J1.2 uses for TPMS. Could they like Tesla have changed to Bluetooth? Or is it still the same but different settings?

 

[1pennyshort]

The plot thickens... I just got off the phone with the Porsche dealership service department. Before they even wanted to talk about the new TPMS, they told me that apparently the wheels in the MY25 are also different and I should not be using wheels from older Taycan models. Something about moving from 19mm to 17mm bolts, but light on details. According to them, using older wheels is not safe (and here in Switzerland also illegal, as they're really strict about non-OEM anything)

I have a really hard time believing this and I think the change from 19mm to 17mm happened a few years back. Moreover, my wheels fit perfectly and I haven't noticed any issue, driving around for several days.

When pushed more, the service advisor more or less admitted that they do not know the details, as the MY25 Taycans are too new. Needless to say, nobody warned me about this during the purchase process, when I told them I already have a winter wheel set...

This could all be a false alarm, I don't know, but since it's a potential safety issue, I wanted to let you all know. I will be double-checking my wheels and fit the moment I get home.

My car came with 21" Cross Turismo Design wheels. It's really hard to believe that these are different wheels from prior years, just for My25...

 

[Boss Hogg]

The plot thickens... I just got off the phone with the Porsche dealership service department. Before they even wanted to talk about the new TPMS, they told me that apparently the wheels in the MY25 are also different and I should not be using wheels from older Taycan models. Something about moving from 19mm to 17mm bolts, but light on details. According to them, using older wheels is not safe (and here in Switzerland also illegal, as they're really strict about non-OEM anything)

I have a really hard time believing this and I think the change from 19mm to 17mm happened a few years back. Moreover, my wheels fit perfectly and I haven't noticed any issue, driving around for several days.

When pushed more, the service advisor more or less admitted that they do not know the details, as the MY25 Taycans are too new. Needless to say, nobody warned me about this during the purchase process, when I told them I already have a winter wheel set...

This could all be a false alarm, I don't know, but since it's a potential safety issue, I wanted to let you all know. I will be double-checking my wheels and fit the moment I get home.

My car came with 21" Cross Turismo Design wheels. It's really hard to believe that these are different wheels from prior years, just for My25...

I had J1 20" wheels on my car for a short while and they fitted fine, pretty sure the bolts were 17mm.

Various wheelsets are the same J1 to J1.2 so would be odd to have the same designs but different bolt sizes.

Sounds suspicious to me, like when my dealer told me about the oil and spark plug change I needed at servicing time.........

 

[Boss Hogg]

So I’m making some progress:

• J1.2 sensors are not Bluetooth, they are 433mhz
• J1.2 sensors are different part numbers to J1.
• J1 = Huf 9A790727592 per this thread https://www.taycanforum.com/forum/t...m-and-aftermarket-resources.6343/#post-333538
• J1.2 = Huf 95C.907.275
• My Bartec reader requires selection of the car make, model, year to read the TPMS sensor. It does not have J1.2 Taycan in the library yet so it did not read the J1.2 sensor (it read the J1 sensors fine). I then played around and selected different models and it read the sensor when I chose the 2025 Macan, so new Macan and J1.2 Taycan have same sensors.

So this confirms J1.2 TPMS sensors are different to J1, bummer. Next step, for another day, is to figure out how to get the car to recognise the J1 sensors….

 

[Scandinavian]

So I’m making some progress:

• J1.2 sensors are not Bluetooth, they are 433mhz
• J1.2 sensors are different part numbers to J1.
• J1 = Huf 9A790727592 per this thread https://www.taycanforum.com/forum/t...m-and-aftermarket-resources.6343/#post-333538
• J1.2 = Huf 95C.907.275
• My Bartec reader requires selection of the car make, model, year to read the TPMS sensor. It does not have J1.2 Taycan in the library yet so it did not read the J1.2 sensor (it read the J1 sensors fine). I then played around and selected different models and it read the sensor when I chose the 2025 Macan, so new Macan and J1.2 Taycan have same sensors.

So this confirms J1.2 TPMS sensors are different to J1, bummer. Next step, for another day, is to figure out how to get the car to recognise the J1 sensors….

That is good progress. Now you need to buy some programmable sensors that your reader can programme and then just copy the four sensors in your J1.2 wheels, corner by corner.

I did that process for my non OEM winter wheels and have been happy since then. If you have a large tyre shop that sells wheels and programmable sensors, it is an hours work to change them and cheap. Porsche will quote 6 times more.

 

[chun]

(and here in Switzerland also illegal, as they're really strict about non-OEM anything)

Never heard of this. What city / dealership is this?

Most of the guys working at the dealerships are clueless about these EV models...

Do you own the car or is it leased? I could see them bitch if its leased.

 

[1pennyshort]

Never heard of this. What city / dealership is this?

Most of the guys working at the dealerships are clueless about these EV models...

Do you own the car or is it leased? I could see them bitch if its leased.

This is Porsche Zentrum Zug and I own the car, but that never came up in the coversation.

I really think the Service person wanted to be helpful, but said that based on very thin information, maybe didn't want to take any risks, but unfortunately made me scramble to find an independent shop willing and able to install the new TPMS.

 

[Bennachie]

Macan ICE uses 19mm bolts. Taycan J1/J1.2 use 17mm

 

[Boss Hogg]

Macan ICE uses 19mm bolts. Taycan J1/J1.2 use 17mm

The J1.2 TPMS sensor is the same as the Macan not the wheel bolts.

 

[Boss Hogg]

So I tried the OBD2 connection with the TPMS device to read the cars TPMS data but it failed to read anything.

Call out the supplier for help!

A set of 4x 433mhz programmable sensors was supplied with the TPMS device, hoping they will work with the Taycan by cloning the current wheel sensor ID's

 

[jhoward]

Any update on this saga? I’m trying to get some TPMS for my winter wheel setup but I don’t know what to buy.

Like how confident are we that Huf 95C.907.275 will work?

 

[1pennyshort]

Any update on this saga? I’m trying to get some TPMS for my winter wheel setup but I don’t know what to buy.

Like how confident are we that Huf 95C.907.275 will work?

The J1 II specific sensors I was sold by the Porsche dealership are labeled "95C 907 255 A" and they indeed work.

 

[jhoward]

Great, thanks for the info. I’ll see if my dealership can get me some of those too.

 

[4sCT21]

If we want to buy J1 wheels for winter setups for the J1.2 in the UK, are we stuck paying over £400 for porsche branded ones?

Considering my options.

Cheers

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