If your 2024 Subaru WRX is displaying a P0305 code indicating a cylinder 5 misfire, this code requires diagnostic investigation. The 2024 WRX continues with the 2.4L turbocharged flat-four engine as its sole powertrain. With only four cylinders, P0305 is technically anomalous.
2024 WRX Powertrain
The 2024 WRX uses the FA24 2.4L turbocharged flat-four producing 271 horsepower (or 275 hp in manual transmission variants). This boxer-configuration engine maintains Subaru's tradition of rally-inspired four-cylinder turbo performance.
Understanding the Anomalous Code
Since the 2024 WRX 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.