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early E53 X5's may not have TPMS, or even FTM
Quote:
Originally Posted by Cadesto
Since our E53’s don’t have tire pressure monitors, they use a system that reads the all 4 tires via X-drive system.
If they don’t all rotate at the same speed or cadence it triggers the low tire light again....
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Quote:
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Originally Posted by X5 Meister
from https://xoutpost.com/545476-post5.html E53 X5's from 4/2004 do not have a TPM (tire pressure monitor) strictly speaking. They have a FTM (flat tire monitor) which uses data from the wheel ABS/speed sensors to detect a change between the rotation rate of one tire versus another. A significant difference in rotation rates and the system interprets it as a "Flat Tire."
A TPM uses actual sensors mounted to the wheel to detect actual "Tire Pressures." which were optional on E53 X5's up to 4/2004.
The car must have the electronic module (for FTM) or multiple modules (TPM) for the system to work.
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And then there are some E53's that have neither system, TPMS or FTM, I think. My decoded VIN shows neither option listed, and my center dash doesn't have the "TPMS reset" button on it. Can't find any reference to either, in the manual. 
I got my X5 in a long-planned swap from my neighbor, who wanted my retired race car. He'd have to restore (to a certain point of driveability) an AWD or 4WD vehicle, of my choosing (subject to a few stipulations). Among those was included that I do not like TPMS systems, since they're nothing but trouble, and specified that the vehicle I would receive (in exchange for my Chevelle drag car) should be prior to the mandatory onset of having TPMS. Actually, I requested a 2000-2001 X5 (loved the X5 when it came out, but never get the first year model of any vehicle), a 1996-2001 Jeep XJ or WJ (perhaps the easiest to restore), or a 1996-2004 S-10 Blazer (I have a soft spot in my heart for S-10's). 3.5+ years later, we swapped the cars, and I was glad to see no TPMS.
I'm an old tire-kicker from way back, and always have a good tire pressure gauge in my vehicles, so I'll do the pressure-checking, myself. And, from a million miles plus of experience, I can usually tell a low tire by seat-of-the-pants feel, while driving. Don't need no fancy TPMS!
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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"
Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E
Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide
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