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Hi and welcome. If the dealer has confirmed that they have repaired the problem that the codes are coming up then the problem must be with the computer.When the computer senses a fault it must go thru so many drive cycles to confirm it is a fault before bring the lite on and if the proper repairs are being made then the computer is not seeing that the repairs are made. You might want to consider finding a good saab mechanic with proper software just to get a second opinion couldn't hurt. If you have any further questions let me know.