If your 2022 Subaru WRX is displaying a P0305 code indicating a cylinder 5 misfire, this code requires diagnostic investigation. The redesigned 2022 WRX uses a 2.4L turbocharged flat-four engine as its sole powertrain. With only four cylinders numbered 1-4, P0305 is technically anomalous.
2022 WRX - New Generation
The fifth-generation 2022 WRX features the new FA24 2.4L turbocharged flat-four producing 271 horsepower, replacing the previous EJ257 2.5L turbo. Despite the engine change, the WRX remains a four-cylinder vehicle.
Why P0305 Cannot Be Valid
The 2022 WRX's 2.4L turbo flat-four has exactly four cylinders. A P0305 code references a non-existent cylinder 5, indicating a diagnostic error rather than an actual misfire.
Possible Causes
As a first-year redesigned model, ECM software calibration issues could store incorrect codes. Scan tool compatibility may cause errors. Low battery voltage affects ECM 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.