If your 2024 Subaru Outback is displaying a P0305 code indicating a cylinder 5 misfire, this code requires diagnostic investigation. The 2024 Outback offers only four-cylinder engines: the 2.5L naturally aspirated flat-four and the 2.4L turbocharged flat-four (XT models). Neither has a cylinder 5, making P0305 technically anomalous.
2024 Outback Powertrain Options
The sixth-generation 2024 Outback offers the 2.5L FA25 flat-four (182 hp) on standard models and the 2.4L FA24 turbocharged flat-four (260 hp) on XT and Onyx Edition XT trims. Both are boxer-configuration four-cylinder engines. The flat-six option from earlier generations is no longer available.
Why P0305 Cannot Be Valid
All 2024 Outback engines have exactly four cylinders numbered 1-4. A P0305 code references a non-existent cylinder 5, indicating a diagnostic error rather than an actual misfire.
Possible Causes
ECM software issues can store invalid codes. Scan tool communication errors may misread data. Low 12-volt battery voltage affects computer reliability. Aftermarket tools may have compatibility issues with Subaru systems.
Diagnostic Recommendations
Use a Subaru SSM or compatible scan tool to verify codes. Test battery condition. If actual misfire symptoms exist, focus on cylinders 1-4. Clear the erroneous code and monitor.