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Is it a particular sensor or all of them?
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Ok, I was wondering if the dealer had narrowed it down to a single sensor losing contact or if it was a system issue. Apparently it is not the sensors but the system itself.
Is it doing it in the same area all the time? There is a tsb for electromagnetic interference. Here it is if you want to read through it. If this does not apply you are likley going to need a new tpms module.