An improperly tightened nut has forced Subaru to announce a recall for a certain number of the 2021 Outback and 2021 Impreza in the United States.

During assembly, the continuously variable transmission (CVT) select lever cable nut was not tightened accordingly by a factory worker, who used “an improper torque wrench technique” despite having been trained for the job, so the gear selector may not function properly.

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A total of 383 cars are included in this safety recall, according to the National Highway Traffic Safety Administration (NHTSA), with a 40 percent estimated defect rate. The Outbacks (314 units) were assembled between December 14 and 21, 2020, and the Imprezas (69 units) were put together from December 14 to 18, 2020.

“A single associate assigned to a specific production line working between the production dates specified was found to be using an improper torque wrench technique”, the safety agency noted. “All vehicles potentially affected by this associate are included in the identified population.”

The problem was discovered during sampling on the assembly line on December 21 in one vehicle. The Japanese automaker started an internal investigation and found that 91 vehicles built by the same worker were compromised. The decision to announce a recall was taken last month and the automaker is unaware of accidents or injuries related to this condition.

The planned owner notification is scheduled for February 19, and dealers were already informed to inspect all cars and tighten the nut, free of charge.

The number for this recall is WRA-21 and Subaru can be reached at 1-844-373-6614. The NHTSA’s Vehicle Safety Hotline phone number is 1-888-327-4236.