P0171 codes x 3 in 2013
Basically vacuum leak (airbox not seating properly,faulty/dirty MAFs, faulty PCV valve, intake manifold gasket) , faulty fuel pump/rail sensor, purge valve could cause this code to show up.
For piece of mind extend your CPO warranty if possible. When will it expire?
my service guy at MB said within 1-3 yrs they'll do a recall on the intake manifold because I guess in pre 2011 car's the intake manifold had a design issue or something, not entirely sure but the tech said that usually it happens after 100,000KM, and with the new intake manifold the issue is fixed (thankfully)


