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porsche 928 s4 tyre pressure monitor reinstall

hi
i have just changed my rims back to the original ones and wanted to get the tyre pressure monitor working again.

since i bought my car the warning light on the dash has always been on due to the alloys i had on did not have the monitoring system on it. now that im changing back to the original slotted rims i wanted i want to get them working again.

my car has just come back from porsche for a service and they wanted 3000 to reinstate the monitoring system so i said no

how hard is it to do? do i need to buy original sensors to fit inside the wheels? do i have to do any other wiring changes?

has anyone got a link to a do it yourself?
much appreciated
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Porsche 928 S4 1989,Auto, 93K on clock, gun metal grey with cream interior. Coulsdon, Surrey, UK
Old 05-03-2017, 02:34 AM
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hi
is it as straight forward as changing the sensors on the rims? front and back and then just having them balanced.
does anyone know where i can buy some at a reasonable price>
thanks
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Porsche 928 S4 1989,Auto, 93K on clock, gun metal grey with cream interior. Coulsdon, Surrey, UK
Old 05-06-2017, 09:39 PM
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The sensors are very rare and expensive, even used. The ones I bought were from 928 International a year or more ago. I think I bought mine during the Nov-Dec half price sale and they were still about $50 or more each, I can't remember for sure. When you buy some I strongly recommend buying all 2.5 BAR sensors since you do not want to have to keep 44 pounds of air in the rear tires to keep the system quiet. That tends to make them doubly rare.

Jerry Feather
Old 05-07-2017, 07:10 AM
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cool thanks for the reply
do you know if they are easy to install???
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Old 05-07-2017, 09:13 PM
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Removal and installation takes a special set of tools. I made some for my own use, but don't know right now where they are. I am not sure of the availability otherwise. There must be some around?
Old 05-08-2017, 05:28 AM
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i've decided to have them ripped out and have the rims soldered

then jumper the ecu

such a shame porsche want stupid money to fit something so minor
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Old 05-12-2017, 11:13 AM
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Now I am confused. You originally said it was L3000 to reinstall the system which sounded like you needed to put all or most of the system back into your car. Now you are going to remove something and have the wheels soldered. That sounds like you already have wheels with sensors in them. If so all you actually need is the 4 RDK 2.5 BAR sensors for the rear wheels, and you should be able to get them from 928 International, if they have some in stock. Then you are going to jumper the ecu which also sounds like it is still in the car. So since you already have the whole system and need only to change the rear sensors, why are you going to rip the whole thing out? I suspect you can replace the rear sensors about as cheaply as it will be to weld up the 8 holes in the wheels, and even that probably destroys the value of the wheels which might be quite a bit since they are pretty rare.
Old 05-12-2017, 11:40 AM
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ok thats not good news.

this is why i was asking the question about getting them back to working condition.
porsche wanted 3000 plus to get them working.

the rims i had on my car were casing the car to shake at around 60mph. so rather than fix those i asked porsche to put my original ones back on and have them re sprayed.

they where the one who told me to re do the rims they would have to remove the old sensors and weld the hole shut.

seeing as i wasn't going spend 3000 plus i had no choice but to weld the shut.

hence my original question. if i had your answer earlier i would have thought twice.

i think Porsche gave me the wrong advise and now its to late

but thanks for letting me know. i may still look around for another set of these rims at a later time and change it alllllllll back again
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Old 05-14-2017, 10:27 PM
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So, on Friday you have decided to "have them soldered," which is future tense, and now on Sunday it is too late? How did you get all of that done on Saturday and Sunday?

Jerry Feather
Old 05-15-2017, 06:41 AM
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Your information is still very puzzling, even moreso now. First, rims do not in themselves cause vibration at any speed unless perhaps one of them is bent. Second, if Porsche was going to replace the rims and needed to weld up the RDK sensor holes, how was that going to reinstate the system , and for L3000? Third, if Porsche was going to replace the rims for you and they were going to bypass the RDK system why wouldn't they just install slotted rims without the RDK system in them? There are many more of those rims around, even likely new, than the rims with fRDK holes in them, and likely very much cheaper.

I could go on, but your whole story isn't working out, at least not for me.

Jerry Feather
Old 05-15-2017, 07:16 AM
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lol
ok guys sorry for the miss understandings.

first it was the previous week i was talking about ie the Friday before the weekend when i posted my reply.

i had two sets of alloys. the original and the an aftermarket set. my aftermarket set were buckled according to 3 different garages. the last garage being Porsche.

hence i took my original set to porsche and told them to fit those and see if the shaking of the steering wheel would stop. which it did.

so i asked them to refurbish the alloys for me and reinstate the tyre pressure monitoring system. That's when they told me the cost of 3000 plus to get the monitoring system back up and running. so i said no to that and just refurb the alloys and leave them on.

That's when they told me they could not refurb them unless they took out the monitoring system in the rims and weld the hole shut. I just wanted my car back fixed so i gave them the go ahead.

sorry for all the confusion and i hope that clears up my problem.
if i had the correct information before i gave them the go ahead to weld. i would have just stopped and taken the car back and tried sorting out the monitoring system first then got the rims refurbed at the same time.

as i said earlier i think Porsche should have advised me better
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Old 05-17-2017, 10:47 PM
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oww and yes the tyre monitoring system was already in the car, i just presumed they needed the sensors in the rims changing or fixing or whatever they had to do. but at the 3000 plus quote i had to say no. and go down the route of welding
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Old 05-17-2017, 10:49 PM
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Ok, that is a story very well put, now. It looks like Porsche really screwed you in that deal. With the system in the car and apparently still working, since the warning was always on with the other alloys, and you having the original wheels with the sensors in them, it is very likely that the system was completely intact and working with the original wheels on it.

On top of that I would not be surprised to learn that they kept the RDK Sensors that they removed and welded up the holes.
Old 05-18-2017, 05:25 AM
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yah according to them the rdk sensors were not working.. i feel gutted.

to top it off i'm just about to move homes. the cost may mean i have to sell my car

at the moment i'm doing my sums to see if i can still keep her. (can i sell the wife instead )
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Old 05-29-2017, 11:27 PM
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Send pictures and tell about the mileage and maintenance.
Old 05-30-2017, 04:51 AM
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Jerry,
He is located in England. Are you wanting pictures and mileage of the wife? or of the car?
You know that maintenance will be high for a wife.
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Grand Prix White 1994 GTS AT (The GTS)
Cobalt Blue 1989 S4 AT (The Blue Car)
Indishrot 1984 Euro S AT (The Stepson)
Black Metallic 1984 Euro S 5 speed (The Schwartz)
Old 05-30-2017, 09:54 AM
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It will probably cost about the same amount to ship the Wife over here as to ship an S4 here from the East Coast. The maintenance will probably be about the same. I'm most concerned about the deferred maintenance and the mileage.
Old 05-30-2017, 11:48 AM
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Lol
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Old 05-30-2017, 02:56 PM
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lol

wife is worth a million minus used condition so discounted by 995,000.000

well the car.. you name it it has been done. to list a few details

Porsche 928 s4 non cat 1989
3 keys
can't remember but i think im the 9/10 owner
linen leather interior
heated seats
electric seats
electric mirrors
sunroof
everything original stock except pearl side mirrors. which are on but i haven't finished wiring them in
original blaupunkt radio is in my garage
alpine bluetooth fitted at moment
10 speakers
even the phone prep that was originally installed but is in my garage at the moment. i toot it off to make room for the wife. her knee kept hitting the receiver so rather her brake it i took it off

hpi clear meaning not a write off and no mileage discrepancies 100% accurate mileage

mileage 97150
full service history from Maserati, Porsche and Parr Porsche and a few other specialists. book is nearly full last service was by parr
http://www.parr-uk.co.uk/

flex plate checked and adjusted
gearbox has been checked and all links changed/ renewed (all reconditioned) works perfectly
all belts changed
fuel, pump ignition leads, etc all changed out
new brake pads and shims
brake oil changed
rear brake shoes changed
air con rad changed and re gassed all working
vacuum pipes all checked and in good sealed condition , no leaks
alloys as you know total refurbish by Porsche minus sensors but the rdk is still in the car
timing belt changed and water pump
new heat shields fitted between body of car and exhaust
car is bone dry no oil leaks.

most probably a lot more so any thing specific please ask
shes even had a full Porsche inspection and has passed with a clean bill of health. any thing they picked up on was fixed by them ie alternator belt had a split in it so they changed it.

car has 2 alarms one fitted by the original Porsche dealer and then somewhere over the years a sigma alarm immobilizer
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Old 05-31-2017, 09:14 AM
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Old 05-31-2017, 09:21 AM
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