Some 2016-2021 Mazda MX-5 vehicles built before February 4, 2021 may exhibit a clunk noise from the rear suspension when driving at low speeds and/or turning, due to the rattling of the bushing of the upper lateral link in the rear hub support. Dimensional variation of the bushing boots in the rear hub support may cause insufficient sealing which allows water to enter the rear hub support, resulting in rust on the pillow-ball. The rust then accelerates the pillow-ball wear and causes a gap between the body and the bearing, resulting in a clunk noise. To eliminate this concern, the boots in the rear hub support have been modified to improve sealing.
Replace the hub support as needed. The new hub support for the right side is P/N N243-26-11XA. The left hub is P/N N243-26-12XA. New nuts are P/N D651-33-042A.