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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 04-23-2013, 04:22 PM
rsandez rsandez is offline
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Tire keeps losing air.

Hey guys I need help here. I'm currently running on run flats and this weekend my low tire sensor came on. Shortly after filling up the tire the sensor came back on not even 10 minutes after I did this. Therefore I took it to a local tire shop to get it checked and everything came out ok. To play it safe I ended up buying a new tire and after driving off the shop my tire was low again. I think I found the problem, it looks like the "air valve" is ripped/broken. I was moving it around and while doing so I heard the air come out. The question I have is, can I fix it at any tire shop? Or do I have to buy the "valve and sensor at a dealer? If so how much does it usually run for?


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  #2  
Old 04-23-2013, 04:30 PM
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SilverX3 SilverX3 is online now
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Check the pressure with a pressure gauge... don't rely on TPM

Check several times... if it's losing air then

1. a leak somewhere
2. or valve issue
3. or rim

then have the tire check out / repaied at tire shop

It's that simple

(happened to me 2 months ago... turned out I have a light rim dent Inside rim.... had the rim re-rolled and repaired the dent for $70)
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  #3  
Old 04-23-2013, 04:36 PM
ddeliber ddeliber is online now
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Are you saying that you went to a tire shop and 1) they couldn't fin a leak 2) you replaced the tire and they let you leave with the same leak? WEAK! What year is your 328? if it is post 2007 you have TPMSs in there and the valve stem is a part of them. There is a kit for like 7 bucks that replaces the seals (inside and out) to prevent this. I honestly can't believe that a tire shop doesn't know this, these sensors are required by law, every car newer than 2009 I think hast to have them. Take it back to them and get them to fix it. The thing is, if you have been driving on a runflat with low pressure, it is shot and needs to be replaced! Yes, that new tire you just bought and they mounted because of a leak that they failed to fix is probably garbage now. This one has to be on them. They will surely try to simply repair the leak and send you on your way, don't let them! Get them to put a new tire on it. Total incompetence!
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Old 04-23-2013, 05:31 PM
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I'm guessing you may have a leak somewhere. Make sure to first check the pressure then reset from iDrive.
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Old 04-23-2013, 05:56 PM
gcreese gcreese is offline
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My wife hit a curb and nailed the two right tires on our wagon, to the point where they had to be replaced. I think the BMW dealership reused the two valve stems and we've had slow leaks ever since. The front tire isn't too bad, but the rear loses about 6 PSI in a week. I just religiously check the tire and refill it when needed. I wouldn't be surprised if you're seeing the same thing, although your air loss is much greater.
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Old 04-24-2013, 06:56 AM
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raleedy raleedy is offline
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A cracked or broken rim will cause air loss, too.
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Old 04-24-2013, 10:56 AM
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tturedraider tturedraider is offline
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A reputable tire shop should replace the valve stem when doing a tire replacement. A reputable tire shop also should have been able to diagnose a damaged valve stem as the source of your problem and not taken the opportunity to sell you a tire you don't need. Replacing a damaged valve stem should not require replacing the TPMS unit.
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Old 04-24-2013, 11:02 AM
ddeliber ddeliber is online now
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Quote:
Originally Posted by tturedraider View Post
A reputable tire shop should replace the valve stem when doing a tire replacement. A reputable tire shop also should have been able to diagnose a damaged valve stem as the source of your problem and not taken the opportunity to sell you a tire you don't need. Replacing a damaged valve stem should not require replacing the TPMS unit.
Yes, and yes. But isn't the valve stem a part of the TPM sensor? at least since 2007ish. The kit mentioned earlier replaces the seals at the valve stem/TPMS (inside and out). These kits should be readily available. I am suspecting that you have the sensors because standard procedures when replacing a tire include new valve stems (if they are not integrated with the sensors of course). But then again, with the way this shop seems to work, you can't really assume much.
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Old 04-24-2013, 01:38 PM
aznalan15 aznalan15 is offline
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if valve stems are not with the tpm it should be under 10 dollars
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