What is the point of a air check system valve? Will it make u fail inspection?
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2000 Cadillac Seville SLS Question: Does code p0301 have anything to do with replacing your air check system valve?
Answer #1cardocIII from Gillespie's Auto Service, March 14, 2014, 18:16Master
No, P0301 is a misfire cylinder #1. The secondary air system is part of the emission controls and it delivers air to the exhaust manifolds during a cold start to reduce hydrocarbon emissions and assist in getting the catalytic convertor to work faster.