What NHTSA says the defect is
Mazda North American Operations (Mazda) is recalling certain 2004 Mazda RX-8 vehicles. The ball joint socket on the front suspension lower control arm may crack and the ball joint may separate from the socket.
The risk NHTSA states
If the ball joint separates, steering control may be lost, increasing the risk of a crash.
The remedy NHTSA states
Mazda will notify owners, and dealers will replace the front lower control arms, free of charge. The recall began on July 31, 2017. Owners may contact Mazda customer service at 1-800-222-5500. Mazda's number for this recall is 1117E.
Campaign 17V355000 · reported to NHTSA 1 June 2017 · Read it on nhtsa.gov →