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reoccurring airbag ignitor fault

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I had a fault for a "bad ignitor" on the left side impact airbag (didn't catch the exact fault # when I spoke to the service manager). Had this replaced at a dealer and everything was fine for about 5 days, then the same fault returned. They think maybe the the airbag control unit needs replaced, but said that would be odd for a car that has never had its airbags deploy. I found many topics on airbag faults and how to clear them but no topics on reoccurring failures. Ideas anyone?

Also, I'm scheduled to autocross it next weekend; Does anyone know if an airbag fault would pass tech inspection at the track?

Brian - '99 996 C2 Coupe

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Fault codes 12, 13, 28, 29, 40 Ignition circuit, driver's side airbag

Possible cause of fault:

- Short circuit to B+/ground or open circuit in the wiring between the driver's side airbag unit and the airbag triggering unit

- Driver's side airbag faulty

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