Some of the common Audi engine problems that have been reported include a steering and suspension issue in the Audi S4 model. This is due to the aluminum construction, which makes the Audi S4 models more susceptible to damage. There are electrical issues reported as well, such as problem with the power windows and display lights. The ABS display sometimes fails, too. Dead pixels on gauge displays can make the display difficult to read. You might need to replace the entire gauge cluster, which can be a rather expensive repair. There does not seem to be an easy or inexpensive alternative to replacing the cluster.