If your 2022 Subaru Forester is displaying a P0305 code indicating a cylinder 5 misfire, this code requires diagnostic investigation. The 2022 Forester uses a 2.5L naturally aspirated flat-four engine as its sole powertrain. With only four cylinders, P0305 is technically anomalous.
2022 Forester Powertrain
The fifth-generation 2022 Forester uses the 2.5L FB25 flat-four producing 182 horsepower across all trims. No other engine option is available. The Forester has never offered a six-cylinder engine.
Understanding the Anomalous Code
Since the 2022 Forester has exactly four cylinders numbered 1-4, a P0305 code cannot represent an actual cylinder 5 misfire. This is an erroneous diagnostic code.
Possible Causes
ECM software issues can store invalid codes. Scan tool communication errors may misread data. Low battery voltage affects ECM reliability. Aftermarket diagnostic tools may have compatibility issues with Subaru electronics.
Diagnostic Steps
Use a Subaru SSM or compatible scan tool to verify codes. Test battery condition. If actual misfire symptoms exist, diagnose cylinders 1-4. Clear the erroneous code and monitor.