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Audi A4 Recall 21V295: Rear axle lock nut can break, risking loss of control

NHTSA campaign 21V295, reported April 26, 2021, 40,993 vehicles potentially affected.

What this recall means for you

A lock nut on the trailing arm of the rear axle can break over time because of stress corrosion. If it breaks, the rear axle may become misaligned, which can cause the vehicle to lose control and increases the risk of a crash.

Dealers will replace the lock nuts and, where needed, the associated bolts, at no cost to you. Owner notification letters were mailed June 4, 2021. If you have questions, you can contact Audi customer service at 1-800-253-2834 and reference recall number 42L1.

To check whether your vehicle has any open recalls, enter your VIN on the NHTSA recall lookup site or ask an authorized Audi dealer to run a check.

Check whether this recall is open on your vehicle

The repair is normally free at an authorized dealer.

Official recall notice

Safety recall 21V295Volkswagen Group of America, Inc.
Component
SUSPENSION:REAR:AXLE:NON-POWERED AXLE ASSEMBLY
Problem
Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Q7, Q8, Q5 Sportback, SQ5 Sportback, RS6 Avant, RS7, RS Q8, 2020-2021 Audi S6 sedan, Q5, A8, S8, A7, A6 Allroad, A5 Cabriolet, A4 sedan, A4 Allroad, SQ5, S7, A6 sedan, S5 coupe, S4 sedan, S5 Cabriolet, A5 coupe, 2019-2021 RS5 coupe, A5 Sportback, S5 Sportback, RS5 Sportback vehicles. The lock nut on the trailing arm of the rear axle may break due to stress corrosion.
Risk
A broken lock nut may misalign the rear axle, causing a loss of control and increasing the risk of a crash.
Remedy
Dealers will replace the lock nuts and, if necessary, the associated bolts, free of charge. Owner notification letters were mailed June 4, 2021. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 42L1.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.

Affected vehicles

Audi A420202021
Audi A5201920202021
Audi A620202021
Audi A720202021
Audi A820202021
Audi Q520202021
Audi Q72021
Audi Q82021
Audi RS 5201920202021
Audi RS 6 Avant2021
Audi RS 72021
Audi RS Q82021
Audi S420202021
Audi S5201920202021
Audi S5 Cabriolet20202021
Audi S620202021
Audi S720202021
Audi S820202021
Audi SQ520202021