If your 2024 Subaru Impreza is displaying a P0305 code indicating a cylinder 5 misfire, this code requires diagnostic investigation. The redesigned 2024 Impreza uses a 2.5L naturally aspirated flat-four engine as its sole powertrain. With only four cylinders numbered 1-4, P0305 is technically anomalous.
2024 Impreza - New Generation
The sixth-generation 2024 Impreza features updated styling and the 2.5L FB25 flat-four producing 182 horsepower, replacing the previous 2.0L engine. Available only as a hatchback, the sedan variant was discontinued. All configurations use this four-cylinder engine.
Why P0305 Cannot Be Valid
The 2024 Impreza's 2.5L flat-four has exactly four cylinders. A P0305 code references a non-existent cylinder 5, indicating a diagnostic error.
Possible Causes
As a newer generation, ECM software calibration issues could cause incorrect codes. Scan tool compatibility may cause errors. Low 12-volt battery voltage affects computer reliability. Check for TSBs addressing known issues.
Diagnostic Recommendations
Use a Subaru SSM or compatible scan tool to verify codes. Check for TSBs. Test battery condition. If actual misfire symptoms exist, focus on cylinders 1-4. Clear the erroneous code.