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Yes, the dreaded 0491 secondary air. I got my first a month after I bought the car (2002 996) My nephew cleared the code and it was good for another month. YES, it returned so I decided to give it the "Italian tune up" 2 can octane boost, 10 gallons premium fuel, 1 can of fuel system cleaner, a major highway, radar detector and 7000rpm for as long as you can. It's been 4 months and it has not returned.
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