2007 XKR convertible - I was getting intermittent low pressure indications that would switch from tire to tire and sometimes indicate multiple tires. Then it would all just go away. I checked my pressures all were normal about 34 psi. I thought that I’d put this at about 38 psi and see if that get rid of the issue. When putting the valve cap back on the valve stem broke off in my hand. Took it to a tire shop they couldn’t put the correct Tpms back on but installed a plain rubber valve stem temporarily. I called jag dealer this was sat afternoon and their service was not available. They guy at the shop I was at told me the battery will go out on the TPM sensors and the sensors have to be replaced and they have to be programmed. And that the jag dealer will prob have to do it. I read the info people have posted in the forums here and it only confuses the situation. I see similar problems and ppl say they solved this with different methods. So. Here is a list of question that are in my mind if someone can answer clearly based on experience I would certainly appreciate it.

1- is it true that the batteries die and the sensors in the tires just need to be replaced at that time.

2- I don’t know what these cost from Jaguar but I see them online and the prices are not that expensive. But when replacing the sensors do they need programming?

3- how do I know if I need to replace the sensors or the module? My first thought was this is the receiving module because it was happening on all tires. But now I’m thinking maybe the batteries are all dying at the same time. I’m mean it’s a 2007 car.

4- I have had a crazy run of issues with the alternator and battery needing to be replaced on this car over the past 2 years. At least 2 new batteries and 3 alternators. Could that have an impact? Oh and btw everyone on here says use a trickle charger for cars that are not daily drives which mine is not. But my mechanic says no just start the car once a week and let it get up to op temp. He says battery tenders are not good for the batteries. That’s a whole different topic. But if u got input on this I’d be interested.

 

The correct sensors are Seimens (VDO), but I think that changed due to a name change or something. ANY sensor of the correct frequency will work. 315Mhz in nearly everywhere, but 433Mhz in Europe.
These cars self-learn the sensors and NO programming is necessary.
The sensors are usually the first thing to go as rarely do they last more than ten years.
The module is unlikely to go away, but there are also the Initiators (one each wheel well) and the receiver above the Rear Seat Fuse Box.
You need at least one sensor regardless, so just do all four and then see if you still have a problem.

 

Thanks for that input. I got the sensor out that broke your correct it’s Siemans VDO it’s 315 Mhz and it’s marked with a ford pn. Seems like the best first move on my part would be to purchase 4 new sensors and have them installed.

 

Thinking that replacing TPS with a rubber stem would cause a TPMS fault, since the receiver(s) need to see a signal from the sensor, which a rubber stem won't supply. If you did indeed get (15) years from the other sensors, then you're way ahead of the game.

 

Yes the rubber stem without a sensor gives a “no signal” fault from that wheel only. But the rubber stem replacement was after all 4 were already giving false low pressure signals intermittently. Is it likely that all four sensors start going out on the same day? Or would it be due to some other issue like the control module or something.

I know my original post is long winded, sorry , but to clarify the valve stem replacement was after the issue. The tpms valve broke off when I was putting more air in when attempting to troubleshoot the issue. I think it’s unrelated to the problem. I think my next step should be replace the tpms in each of the 4 tires. Does anyone reading this have experience purchasing these online from eBay or Amazon?

 

You have to be careful to not buy sensors that are old stock, where the batteries are already somewhat depleted. Hint: they're low priced.
https://www.garagejournal.com/forum/...f-life.495486/

 

Is there a way to turn off the system so that I won’t get faults when using rubber stems?

 

Replaced my original Dunlops 6 months ago with Michelin 4s and replaced all 4 sensors at the same time. Initially everything worked properly but a few days later the warming came on. I did the lower all 4 tire pressure trick and bring back to normal All has been fine since. One less thing to worry about.

 

Yes there is. You need the right SDD setup, or maybe Autel(?). I'm not sure about Autel though because I've never used it.
Shops are unlikely to help you out because of the liability factor.

 

I thought I would have a hard time finding a shop to do these without it being crazy expensive. The local jag dealer will not work on cars that are more than 10 years old. Which I think is ridiculous and I wonder if that is the same everywhere. But anyway since then I found a local shop that will do them for about $75 a wheel. That seems reasonable.