The 2021 Ford Bronco Sport is powered by 4-cylinder engines—either the 1.5L EcoBoost 3-cylinder or 2.0L EcoBoost 4-cylinder. Neither configuration includes a cylinder 6. When P0306: Cylinder 6 Misfire Detected appears, you're encountering an anomalous code.
Bronco Sport vs. Bronco
The Bronco Sport is a different vehicle from the larger Bronco, built on a unibody platform with only 3-cylinder and 4-cylinder engine options. Unlike the full-size Bronco which offers a V6, the Bronco Sport has no cylinder 6 to misfire, making P0306 a diagnostic anomaly.
Why This Erroneous Code Appears
Scanner confusion between Bronco and Bronco Sport protocols causes incorrect codes. Generic OBD-II scanners may misinterpret Ford's EcoBoost data. ECU communication errors generate false cylinder-specific codes. Aftermarket devices can interfere with diagnostic communications.
Proper Diagnostic Approach
Clear all codes and drive through various conditions. Use Ford IDS or professional-grade equipment for accurate readings. Inspect the OBD-II port for damage. Remove aftermarket plug-in devices temporarily. Focus on legitimate misfire codes—P0301-P0304 for 4-cylinder engines, or P0301-P0303 for 3-cylinder models.
Service Considerations
If actual drivability problems exist, investigate valid fault codes. Ensure your service technician understands the Bronco Sport is 4-cylinder only—different from the V6-capable full-size Bronco.