Hi. I Have a 2008 chevy cobalt an the check engine light just came on. I went to advanced auto parts to have them diagnose it. the employee said it was a "smog filter" . I admittedly know very little about cars an thought I should check here to ask what people think of this diagnoses an is it a real threat to my vehicle
already diagnosed. don't know if it's true or not an what the extent of severity is.
What was the actual code number that they pulled? This number will allow us to double check their diagnoses.
P0411 secondary air injection system / Incorrect flow detected
http://www.obd-codes.com/p0411 --- check this out for possible causes and solutions. Hope this helps
thank you very much for the info.i appreciate your time