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  1. Classic Saab 9-3/GM900 (1994 - 2002)/Conv ( -2003)
    My 9-3 has recently decided to light up the check engine light. OH NOO!!! I had put in some "Nos Octane bosting and fule system treatment" bottle in the fuel tank some time last week and I'm wondering if this could be cause of this as the manual indicates that the check engine light is ignition...
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