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psm pasm abs srs faults come and go

Electrical and Electronic

Model: 997S, Year:2006, Mileage:4500, Type of use:Street use only
My low mileage club coupe has a recurrent problem. Every so often, the pasm, psm, airbag and abs faults light up simultaneously when I start the car. They usually go off after a day or so, other than the airbag light that needs to be dealer reset. Dealer rarely finds any faults stored--once for low voltage and more recently for psm not being properly initialized (?). Problem happens whether I let the car sit a few weeks between drives, or drive it daily. As the car has just come off warranty, and I'm still going back and forth to the dealer to reset lights and get no resolution, any ideas? I get a lot of "we can't fix something we can't find" conversation from the dealer.Further, any strategies to get PCNA to cover my ongoing problem as warranty, as two dealers have reset these faults four or five times without resolution while under warranty?The car is fabulous, the problem is getting pretty annoying. Thanks for any help.

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