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Britax is recalling more than 200,000 child car seats with harness adjuster buttons that may stick and cause the shoulder straps to loosen.

The recall focuses on several models of its Advocate, Boulevard and Marathon ClickTight car seats, all made between Aug. 1, 2014 and July 29. Britax said Friday that no injuries have been reported in connection with the problem.

It will notify customers affected by the recall and send them a lubricant that can be applied to the red harness adjuster button to fix the potential flaw.

Britax Child Safety Inc. estimates that only about 1 percent of the car seats involved in the recall have the problem.

The company says it learned of the issue after seeing a customer’s Facebook post last month. It also fielded some complaints and found others filed with federal regulators. The company then did an audit and found out that some of the harness adjuster buttons in its inventory can remain open in certain conditions after being depressed to loosen and re-tighten the harness.

Customers can determine whether their seat is part of the recall by looking at the date-of-manufacture label under the car seat cover.