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If your 2012 Hyundai Sonata is hesitating, especially when accelerating, it's likely due to the engine running too lean. This means there isn't enough air in the system to properly mix with the fuel for combustion. Several reasons could be causing this issue, but common culprits often involve a malfunctioning sensor. It could be a faulty O2 sensor, indicated by an OBD2 fault code, or it might be a problem with the mass airflow sensor, fuel pump, throttle position sensor, or fuel injectors. Without a detailed diagnosis, identifying the exact cause of the problem is challenging.
Hesitation is an issue with the transmission of the 2012 Hyundai Sonata.