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How many PSI diff. does it take to set off the TPS?

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Old 07-15-2008, 11:40 AM
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Any one got a clue? I had a "flat front left" tire this am. I put a tire gauge to it and found it was like 3-4psi lower the the factory recommended inflation of 32psi(I think or was it 35psi) (sport pack USDM 535I).

My car has the TPS system ( LCI). I put some air in it to bring it back up , and reset the tps. I have yet to check it again since I'm at work.

Is it like only 5% or something like that?
Old 07-15-2008, 04:37 PM
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Originally Posted by bigbadbull' post='624674' date='Jul 15 2008, 02:40 PM
Any one got a clue? I had a "flat front left" tire this am. I put a tire gauge to it and found it was like 3-4psi lower the the factory recommended inflation of 32psi(I think or was it 35psi) (sport pack USDM 535I).

My car has the TPS system ( LCI). I put some air in it to bring it back up , and reset the tps. I have yet to check it again since I'm at work.

Is it like only 5% or something like that?
Sounds about right. On my old 545 with the FTM, I would get a warning with one tire around 5 lbs lower. That was enough to alter the rotation and set off the FTM system. I would suspect TPS is equally if not more sensitive...
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