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Secondary air injection faults usually don't affect the running condition. The SAI injects air into the exhaust stream to dilute and lessen pollutants after cold start until the cat's warm up.
Better odds are the O2 sensor faults/issues are related to the low cold idle.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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