Question about 2001 Audi TT
My 2001 audi TT quattro Service light came on, connected a scanner and got Po411 secondary air injection incorrect upstream flow detected, however there was not any noticeable performance differance
There won't be - the secondary air injection system is strictly for cold-start emissions. You won't see any effects in driving, but if you have any sort of emissions check in your state's inspection, you will fail.
Posted on Nov 19, 2009
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Posted on Jan 02, 2017
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