TPMS PSI wrong

1eyebandit · 02-17-2024, 02:23 PM

HI 6ers, I had a problem with tpms, I replaced my RDC receiver and my 2 rear sensors. The system now show active but my rear tire pressure is inaccurate, they're reading 27.2 and 28.3 respectively. I released the air from both rear tires and refilled them to 41.5 with my portable air compresser, it started off at 0 PSI and automatically stopped 41.5 as thats what's I had it set to. I reset the tpms from idrive and went for a drive and the system reset back to the wrong PSI see attached image. Any clues as to why the PSI is so far off?

TIA

Opie55 · 02-17-2024, 06:08 PM

Probably not the issue, but I would at least double-check the pressure with a decent tire gauge.

1eyebandit · 02-17-2024, 09:15 PM

Thanks, I did. I took it to the 7-11 by my house and the PSI was at 41

scubachris · 02-18-2024, 05:18 AM

hi.
your issue is with the two new sensors you fitted in the rear wheels..the original two front sensors seem to be reading fine.
is it possible the two new rear sensors are faulty or the wrong part number? there are several different sensors for tpms..
the other thing i noticed is your i drive is showing tyre temperatures too,in the uk we only get tyre pressure and to get the temperature we have to have it coded in..im not sure if that is the same where you are.
are the original sensors genuine bmw and the two new ones aftermarket?
also is it possible the front two sensors are reading PSI but the two new rear sensors are not reading PSI but a different scale? its not BAR but could be something else.

02-17-2024, 02:23 PM	#1
1eyebandit Enlisted Member 4 Rep 37 Posts Drives: 2014 650i Convertible Join Date: Sep 2023 Location: Murrieta, Ca iTrader: (0)	HI 6ers, I had a problem with tpms, I replaced my RDC receiver and my 2 rear sensors. The system now show active but my rear tire pressure is inaccurate, they're reading 27.2 and 28.3 respectively. I released the air from both rear tires and refilled them to 41.5 with my portable air compresser, it started off at 0 PSI and automatically stopped 41.5 as thats what's I had it set to. I reset the tpms from idrive and went for a drive and the system reset back to the wrong PSI see attached image. Any clues as to why the PSI is so far off? TIA Attached Images
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02-17-2024, 06:08 PM	#2
Opie55 Colonel 1195 Rep 2,907 Posts Drives: '15 650i Convertible Join Date: Apr 2018 Location: US iTrader: (0)	Probably not the issue, but I would at least double-check the pressure with a decent tire gauge.
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02-17-2024, 09:15 PM	#3
1eyebandit Enlisted Member 4 Rep 37 Posts Drives: 2014 650i Convertible Join Date: Sep 2023 Location: Murrieta, Ca iTrader: (0)	Thanks, I did. I took it to the 7-11 by my house and the PSI was at 41
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02-18-2024, 05:18 AM	#4
scubachris Private 11 Rep 60 Posts Drives: bmw f13 640d Join Date: Jan 2023 Location: north yorkshire iTrader: (0)	hi. your issue is with the two new sensors you fitted in the rear wheels..the original two front sensors seem to be reading fine. is it possible the two new rear sensors are faulty or the wrong part number? there are several different sensors for tpms.. the other thing i noticed is your i drive is showing tyre temperatures too,in the uk we only get tyre pressure and to get the temperature we have to have it coded in..im not sure if that is the same where you are. are the original sensors genuine bmw and the two new ones aftermarket? also is it possible the front two sensors are reading PSI but the two new rear sensors are not reading PSI but a different scale? its not BAR but could be something else.
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