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My 2003 Saab 9-3 is throwing engine codes P0411 (Secondary Air Injection System Incorrect Flow) and P0606 (Powertrain Computer). Is this lights out for this car? I don't mind making some repairs, but I don't want to invest a ton of money into it given its age. I love this car dearly, but I'm realistic about what it might take to keep it alive. Does anyone here have thoughts about how involved and expensive this repair might be?