2002 Audi A4 check engine light

rwagoner · Posted at Mon Mar 17, 2008 5:40 pm

Engine Performance problem
2002 Audi A4 4 cyl Four Wheel Drive Automatic 62000 miles
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I have a P0411 engine code secondary air, what is the most common area to focus on.

2CarPro Jack · Posted at Wed Mar 19, 2008 5:09 am

I would look at the check valves where the AIR pump hoses hook up at the exhaust manifolds. The can break internally causing exhaust to go up into the AIR pump.