2008 RX400h - TPMS Sensors good - ECU bad?

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Hi all,

My wife's 2008 RX400h TPMS sensor light is on... it flashes for a little bit when we start the car then goes solid. I checked all tires for pressure and all good. I then took it to a shop and they verified that all 5 sensors work fine and that it must be the ECU that is not working.

I'd like to try and fix this myself, if possible.

Has anyone experienced this? Any ideas of what I should do?

Thanks,

Jeff