Car manufacturers Hyundai and Kia are recalling more than 1 million vehicles because of engine malfunctions that could lead to accidents on the road.

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According to The Associated Press, nearly 1.2 million cars and SUVs are being recalled due to a defect that can cause engines in the vehicles to stall and fail.

The defect is caused by debris left from manufacturing that can restrict oil flow to connecting rod bearings. Drivers of impacted vehicles may notice a knocking sound coming from the engine or be alerted of an issue via engine warning lights on a vehicle’s dashboard.

Vehicles produced between 2011 and 2014 are included in the recall, specifically Kia Optima midsize cars from 2011 through 2014, Kia Sportage SUVs from 2011 through 2013 and Kia Sorento SUVs from 2012 through 2014, the AP reported. Also included are 2013 and 2014 Hyundai Santa Fe Sport SUVs and Sonata midsize cars.

Hyundai and Kia will notify owners of recalled vehicles, and owners can get their engines inspected and repaired free of charge at dealerships.

The recall is scheduled to begin on May 19.

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