There are 2 owner-reported engine complaints for the 2021 Subaru WRXin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
Excessive blow by contaminating MAP sensors & creating lean/rich conditions. This causes loss of power, stalling and will lead to catastrophic engine failure. EGR system is faulty
In October 2024, my vehicle, a 2021 Subaru WRX STI, was purchased from a Toyota dealership (Fort Bend Sterling McCall Toyota). The dealership sold the vehicle with an oil issue and a modified ECM. This issue caused catastrophic engine failure while driving. The vehicle stalled and could not be started. Subaru dealership technicians confirmed the cause as improper service leading to catastrophic oil starvation. The failure put both myself and others at risk, as the engine lost power mid-operation on a busy road. The vehicle was towed to a certified Subaru dealership, where it has been detained since December 2024. Despite being under warranty, repairs have been delayed for over 6 months due to blame disputes between the dealership, the manufacturer, and the extended warranty provider. There were no prior dashboard warnings or messages before failure, only loss of power and engine noise at the time of the incident. The vehicle has been fully inspected and documented by the Subaru service center, and all evidence has been preserved. I have been without a primary vehicle for over 7 months.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on May 4, 2026