What caused NASCAR driver Denny Hamlin’s car to go up in flames during the Würth 400 at Texas Motor Speedway on Sunday?

Denny Hamlin's No. 11 Joe Gibbs Racing Toyota Camry XSE burst into flames during the NASCAR Cup Series race at Texas Motor ...

A disastrous and short afternoon in Texas for Denny Hamlin. His Toyota Camry just went up in literal flames, and he is done.

Denny Hamlin exits Sunday's NASCAR Cup Series race at Texas early after incurring an apparent engine failure at Lap 75.