My 2.4 liter 2013 with 80K got the P2173 HIGH AIRFLOW/VACUUM LEAK DETECTED (SLOW ACCUMULATION)
I ran a smoke test and no leaks from the intake or any hose, I replaced the Throttle body and the code return, I replaced the Mass sensor and the code return, I replaced the Brake booster and calibrated the Throttle body and the code return after 3 weeks, finally I decide to change the intake manifold gasket 2 months ago, so far it looks that is fixed for good, I found the old gasket was leaking between two cylinders thus the reason the smoke test did not work, to any one with this code I suggest to replace the gasket first, is only $6.00. The P2173 will put he car in limp mode and make it undriveable