DETROIT (AP) — Hyundai is recalling nearly 155,000 Sonata midsize cars in the U.S. because the air bags may not inflate in a crash.

The recall covers cars from the 2011 model year. Hyundai says a short circuit in the air bag control computer can stop the seat belts from tightening before a crash as well as prevent the air bags from deploying.

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The company says in government documents that it has four reports of air bags not inflating. It was not clear if anyone was hurt.

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The cars were made between December 11, 2009 and September 29, 2010.

Hyundai is still working on a fix for the problem. It expects the recall to start on April 20.

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