Toyota Motor recalled 370,000 Sienna minivans -- most of those a second time -- because the spare tire mounted under the vehicle might fall off.

Involved: 2004-2011 Siennas, sold or orignially registered in cold-weather states where corrosive salt is used to de-ice winter roads.

The mechanism holding the spare tire can be eaten away by the salt and the tire can fall off, Toyota said. In April 2010, Toyota recalled 2004-2010 versions of the van for the same problem. At that time, a splash shield was mounted undeneath to deflect the corrosive de-icing mixture away from the spare.

Some of those shields were installed incorrectly, Toytoa said, and might not work.

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