The 2022 Subaru Outback features horizontally-opposed 4-cylinder engines—the 2.5L or 2.4L turbo. Both boxer configurations contain only cylinders 1 through 4. When P0306: Cylinder 6 Misfire Detected displays, you're facing an anomalous code.
Sixth-Generation Outback
The current Outback (2020+) offers only 4-cylinder engines. The popular 3.6R flat-6 was discontinued with the previous generation. P0306 indicates a cylinder that doesn't exist.
Sources of Erroneous P0306
Scanner confusion with older 6-cylinder Outbacks. Boxer engine protocols may confuse generic scanners. Aftermarket devices interfere. ECU glitches generate false codes.
Diagnostic Protocol
Clear all codes and drive normally. Use Subaru Select Monitor or professional equipment. Check for valid misfire codes (P0301-P0304).
Adventure Wagon Legacy
The Outback's boxer engines provide reliable all-weather capability. Use valid codes for concerns.