The National Highway Traffic Safety Administration said that it has opened an audit of the remedy for a recall of certain Kia vehicles.

The agency announced Aug. 6 that it would conduct an audit into over 137,000 2021-2023 Seltos and Soul vehicles that were recalled in February for piston oil rings that may have been manufactured incorrectly.

Dealers were to replace the engine free of charge if necessary, federal safety regulators said at the time, and also install piston-ring sensing noise software free of charge.

The agency said that its Recall Management Division has conducted a review of 47 complaints lodged between April and June that allege that the remedy is ineffective and unavailable.

What caused the recall?

The recall was originally caused by a quality deviation by supp

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