+16 2009 Hyundai Sonata Mass Air Flow Sensor - 12 Week Trainer Courses - STARKS Academy. Sounds like the mass air flow sensor. With the hyundai sonata, p0101 means the the mass air flow (maf) sensor has a range/performance problem.
The hyundai sonata air mass sensor controls the oxygen which is injected the cylinders. The most common signs of bad mass air flow sensor (maf) in hyundai sonata are loss of power or slow acceleration, engine hesitation or jerking during acceleration, erratic. The two most common trouble codes in relation to the maf sensor are: