Engine Valve Spring Failure in Certain Toyota and Subaru Vehicles May Cause Engine Stall

valve springs installed before a design change will be replaced

Engine Valve Spring Failure in Certain Toyota and Subaru Vehicles May Cause Engine Stall
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November 15, 2018

Subaru is recalling certain 2012-2014 Subaru Impreza, 2012-2013 Impreza Stationwagon, 2013 Subaru BRZ, XV Crosstrek and Toyota Scion FR-S vehicles. The engine valve springs in these vehicles may fracture causing an engine malfunction or a possible engine stall, posing a safety hazard that increases risk of a crash.

What's the problem?

In approximately 165,534 vehicles, the valve springs located inside the engine of the affected vehicles may fracture, which may cause an abnormal noise or engine malfunction. In the worst case, the engine may stall during driving.

The issue dates back to April 2012 where a vehicle suffered a valve spring fracture. In order to meet the actual stress from the valve train to the valve spring, the lower limit of the tolerance of the spring wire diameter was raised. This improvement was implemented from May 14, 2013 on the engine manufacturing line. Subaru continued investigating and determined the failure resulted from a limited amount of impurities made it into the valve spring that were unavoidable during manufacturing. Analysis determined that the design change in 2013 compensated for excessive stress placed upon upon the springs that caused them to fracture at a higher rate than expected.

Based on the assessment of multi-national field data and the conclusions of the technical root cause evaluation, Subaru determined that a safety recall will be performed for vehicles that may be equipped with a similar valve train design but with manufacturing dates prior to the tolerance adjustment made in May 2013.

What happens next?

Subaru will notify their owners. Toyota will notify the FR-S owners. Dealers will replace the valve springs free of charge. The manufacturer has not yet provided a notification schedule.

Subaru owners may contact Subaru customer service at (844) 373-6614. Toyota owners may contact the Toyota Customer Experience Center at (888) 270-9371. Subaru's number for this recall is WTY-84.