2009 Aveo with 104000 miles. I have spent years working on cars in shops. For the last 20 years I have been working with high school age kids at a career center. I could not figure out this P0171 lean code. I took it the the dealer, first car I ever took to the dealer to have repaired. They had to replace the valve cover, something about the pcv baffle bad. Car runs great now. I would never have guessed this would correct the problem. Sometimes it takes these guys who work with thus day in day out to knows what the problem is.
