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A defect in Toyota's Tundra pickup truck has forced the OEM to replace engines in some models.

A casting flaw in some of the camshafts used in the
5.7-litre quadcam V8 installed in early versions of the Tundra has caused the component to fail.

Toyota said: “The issue stems from an isolated processing anomaly at a supplier, affecting only a small number of camshafts. We expect the number of contacts for this to be extremely low. We’ve replaced the entire engine, rather than just the camshaft to assure customer satisfaction.”

The Tundra is important to Toyota in the US, competing with traditional cars built by North American automakers. Problems on the launch followed a string of quality issues at Toyota caused by its fast overseas expansion.