This page covers 4 recalls and EPA fuel economy for the 2021 Audi S4.
23 mpg combined
10.2 L/100km
Compact Cars
Fuel economy data from fueleconomy.gov (EPA / U.S. Dept. of Energy). Annual cost based on 15,000 mi/yr at 55% city driving and current fuel prices. MPG is U.S. gallons; L/100km converted.
The 2021 Audi S4 has 4 recalls, the most serious being a broken rear axle lock nut that can misalign the rear axle and cause the driver to lose control of the vehicle.
A related issue stems from the same rear axle misalignment: tires can wear unevenly or prematurely as the misaligned axle puts unequal stress on the contact patch, raising the risk of a tire failure while driving. On the safety equipment side, a rear seatbelt retractor can fail to secure a child restraint system properly, leaving the seat able to shift or tip in a crash rather than staying anchored. There is also a visibility concern: the rearview camera display can go blank when reversing, leaving the driver without any image of what is behind the vehicle.
At a glance
What can fail
A software issue may cause the rearview camera display to show a blank or black screen instead of the camera image when reverse gear is engaged.
What the fix does
Dealers will update the infotainment unit software at no cost to restore rearview camera display functionality.
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Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The rear axle alignment was not inspected after previous recall repairs were completed, which could result in improper wheel positioning and uneven tire wear.
What the fix does
Dealers will inspect rear axle alignment, adjust if needed, and replace any prematurely or unevenly worn tires at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The rear middle seat belt's automatic locking mechanism may stop working too early, preventing child car seats from being secured properly.
What the fix does
Dealers will inspect and replace the middle-rear seat belt assemblies at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The lock nut securing the trailing arm on the rear axle can break due to stress corrosion, potentially affecting rear suspension stability.
What the fix does
Dealers will replace the lock nuts and associated bolts if needed at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
