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#1
04-14-2009, 11:00 PM
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TPM not reliable
I have found on my car a 2007 X5 that the Runflat TPM is not at all reliable in fact downright flaky. I had a puncture in the tire and was running it until a new tire was available.. I checked pressure and it was at 19psi... the runflat monitor did not go off... I pumped up the tire and recalibarated and the same thing 2 days later , no alarm and 19psi... I'll be taking it to the dealer shortly to have it checked out but I can safely say that it is not to be relied upon to tell you.. I now do a visual check of tires evry now and then .. it would be much better if it was a pressure monitor rather than a basic revolution monitor.. I wonder if BMW will ever change that .. on a car that costs this $ it should be standard...
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#2
04-14-2009, 11:03 PM
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Quote:
__________________
-2010 X5 / / / M "Monte Carlo Blue" -2004 X5 4.4i DINAN Stage II
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#3
04-14-2009, 11:05 PM
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BMW has gone to actual tire pressure monitoring. I have it on my 2008 535i, with pressure transmitters in each tire.
I had the wheel-speed sensing system on previous BMW models, and never had a problem. It detected 3-4 psi drops, generally. May be something wrong with your vehicle.
__________________
2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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#4
04-14-2009, 11:30 PM
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Could be a bad sensor....also keep in mind that it takes into account the other tire readings as well. It will trigger with about a 5 psi difference when detected. So check the pressure of your other tires. If all of them are low, that's why you are not getting the alert........Phil
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2011.5 Dinan ///M3: SSII DCT Competition Pkg Convenience Pkg Premium Pkg 2 Heated Seats Enhanced Premium Sound Black Kidney Grills BMW M Performance Steering Wheel BMW Carbon Fiber Performance Spoiler BMW Aluminum Pedals Dinan Exhaust Dinan Mid-Exhaust (x-pipe) Dinan Carbon Fiber Intake Dinan Performance Tune Dinan Pulley Kit Dinan CH-R Wheels Dinan Carbon Fiber Strut Tower Braces Arkym Front Lip Carbon Reflectors Lux H8 V3 Brembo 365mm BBK
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#5
04-15-2009, 12:33 AM
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Quote:
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#6
04-15-2009, 01:03 AM
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I don't quite trust mine either after a couple were 5 below the others when it was near new, but I have yet to do the simple test of deflating it and seeing if it alerts me. Also make sure it is reset after you pump it.
__________________
'08 X5 3.0si - Alpine White / Saddle Brown interior Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights Coded: Digital speedo, windows/sunroof/tailgate close via keyfob X5 pics at Flickr
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#7
04-15-2009, 05:40 PM
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what did the dealer say>?
__________________
Christiaan.... 2008 4.8i 
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#8
04-15-2009, 06:43 PM
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Haven't been there yet.. I'm going to book it in for Wheel alignment , get the foggginess inside my headlights checked , rear hatch springs looked at and TPM checked out at the same time..I did get a software update last time... the TPM did work well before...the latest software update has also slowed the response time when using my USB ipod quite considerably....
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