The P0302 code on your 2021 Ford Mustang indicates the PCM detected repeated misfires in cylinder 2. Whether you have the 2.3L EcoBoost or 5.0L Coyote V8, systematic diagnosis identifies the cause.
Mustang Engine Options
The 2021 Mustang offers the 2.3L High Performance EcoBoost 4-cylinder and the 5.0L Coyote V8 (GT and above). These engines have different characteristics and potential misfire causes.
Cylinder 2 Location
On the 2.3L EcoBoost, cylinder 2 is the second from the front on the inline-4. On the 5.0L V8, cylinder 2 is on the passenger bank. Ford numbers the passenger bank 1-2-3-4 and driver bank 5-6-7-8.
Performance Engine Considerations
Mustangs are often driven hard, which affects ignition component wear. Track days, spirited driving, and modifications can accelerate spark plug and coil wear. The high-performance nature of both engines means they're sensitive to ignition system condition.
Diagnosis Approach
The coil-on-plug design on both engines allows straightforward swap testing. Move the cylinder 2 coil to another position, clear codes, and test drive to see if the misfire follows the component.