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The air injection system will screw up OBD2. The air injection ports in the exhaust become clogged with carbon, if I remember correctly. The O2 sensor doesn't like it and the check engine light comes on.
I am not a late model guy, though. Wait for Bill V. to answer your question and do what he says.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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