Mazda has issued a recall for 5200 of its 2011 and 2012 BT-50 utes fitted with the automatic transmission over concerns a faulty sensor could cause the transmission to downshift into first gear unexpectedly.

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The Japanese manufacturer reports the Output Shaft Speed Sensor in affected vehicles could fail intermittently, which could result in an unintended downshift into first gear.

If the condition occurs while the vehicle is in use, it could cause an abrupt reduction in wheel speed, causing the rear tyres to slide or lock up until the vehicle's speed slows.

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This may lead to a loss of vehicle control, posing a hazard risk to drivers and other road users.

A VIN list for the affected utes can be viewed here.

Owners of the recalled BT-50 models will be contacted by mail, and are encouraged to visit their local Mazda dealer to have their vehicle inspected and repaired free of charge.

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For more information, customers can contact 1800 034 411.