Complaints over time
Complaints about the 2021 Audi S4 peaked in 2023, with 1 filed
Owner complaints about this model year, by the year they were filed with NHTSA.
Source: NHTSA ODI complaints file. The lighter column runs through October.
Model year
2021 Audi S4
Sedan, gasoline, AWD/All-Wheel Drive, built in Germany. Owner complaints on file from Jan 31, 2023 to Sep 25, 2025.
Recall campaigns covering this model year4288k vehicles or units across those campaigns
Owner complaints2Below the median 2021 sedan
Severity index0.02021 sedans average 7.9
First 24 months0Complaints in its first two years
Components
50% of complaints about the 2021 Audi S4 name electrical system
Owner complaints by component. Hover or focus a bar for the crash, fire, injury or death count.
Source: NHTSA ODI complaints file. A complaint can name more than one component; it is counted under the first.
Recalls
4 recall campaigns cover the 2021 Audi S4
Check a specific vehicle by VIN on NHTSA's site: a campaign may cover only part of a model year's production.
| Campaign | Filed | Subject | Component | Vehicles | Remedy |
|---|---|---|---|---|---|
| 22V-742 | Oct 5, 2022 | Due to a software issue, a blank or black screen may be displayed instead of the rearview camera image when the vehicle is placed in reverse gear | Back-over prevention | 170,296 | Software update |
| 22V-034 | Jan 26, 2022 | Rear axle alignment may not have been inspected after the repairs for Recall 21V-295 (42L1) were performed | Suspension | 31,058 | Part replacement |
| 21V-606 | Aug 5, 2021 | Rear seat belt automatic locking retractors may deactivate early, which can prevent the child restraint system from securing properly | Seat belts | 45,496 | Part replacement |
| 21V-295 | Apr 26, 2021 | Lock nut on the trailing arm of the rear axle may break due to stress corrosion | Suspension | 40,993 | Part replacement |
Source: NHTSA ODI recalls file.
Owner complaints
What owners reported about the 2021 Audi S4
The full text of every complaint filed with NHTSA about this model year, newest first. Complaints are filed by owners and are not verified by NHTSA; NHTSA removes personal details before publishing.
2 complaints on file, page 1 of 1.
- Filed Sep 25, 2025Failure Sep 10, 202531,000 milesPortland, ORElectrical system
The contact owns a 2021 Audi S4. The contact stated that while driving at an undisclosed speed, the vehicle experienced a loss of automotive power. The check engine warning light was illuminated. The message "Drive System Malfunction - Please Contact Service" was displayed. In addition, the vehicle hesitated to restart and shift into gear as intended. The contact stated that the failure had progressed over time. The vehicle was taken to a local dealer, where it was diagnosed with needing a pending software service update; however, the repairs would not be available until the end of 2025. The manufacturer was made aware of the failure. The failure mileage was approximately 31,000.
NHTSA complaint 11689741 - Filed Jan 31, 2023Failure Jan 31, 2023Orinda, CAUnknown or other
2021 AUDI S4. CONSUMER WRITES IN REGARD TO NHTSA SAFETY RECALL 22V-742. THE CONSUMER IS DISGUSTED AND DISATISFIED WITH THE AUDI SERVICE DEPARTMENT PROCEDURES FOR PERFORMING THE RECALLS.
NHTSA complaint 11504613
Source: NHTSA ODI complaints file.
Investigations
NHTSA has not opened an investigation on this model year
Source: NHTSA ODI investigations file.
Service bulletins
956 manufacturer communications cover this model year
Technical service bulletins and other notices the manufacturer sent to dealers. A bulletin is not a recall; the 60 most recent are listed.
- TSB_2082977_1 Aug 7, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informaiton when the airbag warning lamp is active, event memory "B200000 - Faulty control module, symptom 305". - TSB_2082976_2 Aug 27, 2026 · Service Bulletin/Repair Instructions
This bulletin provides general information about the current tpp issues for Audi connect. - TSB_2082976_1 Aug 6, 2026 · Service Bulletin/Repair Instructions
This bulletin provides general information about the current tpp issues for Audi connect. - TSB_2081030_3 Aug 13, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is an abnormal engine knocking noise from the engine compartment; V6 3.0L TFSI. - TSB_2079732_2 Aug 11, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is a paint issue on alloy wheels. - TSB_2079696_2 Aug 21, 2026 · Service Bulletin/Repair Instructions
A particularly noticeable factor is the vibration of the air column in a tire. When a tire starts to vibrate because of the road contact, this can lead to cavity resonances inside the tire that are transmitted via the wheel rim and the running gear to the v… - TSB_2078648_3 Aug 4, 2026 · Service Bulletin/Repair Instructions
This service information TSB provides warranty coverage information for vehicles with a broken sunroof panel. - TSB_2076945_2 Aug 20, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information about leather care and seat repair. - TSB_2075120_3 Aug 11, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information about the general approach for brake vibration concerns. - TSB_2074843_3 Aug 21, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is a wheel/tire imbalance. - TSB_2074436_3 Aug 26, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when the horn sound quality is poor. - TSB_20741717_15 Aug 11, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information on the GFF test plan required for AC compressor replacements regardless of the concern. - TSB_2072304_4 Aug 11, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is an ABS/ESC speed sensor implausible signal. - TSB_2069904_3 Aug 21, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information for all models regarding brake sounds. - TSB_2069331_8 Aug 26, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informaitn when there is a warning messsage; "Instrument cluster: fault. Limited warning messages. Please contact workshop"; DTC B200096. - TSB_2069078_4 Aug 21, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information on the zirconium insercts in the brake piston (ceramic brakes only). - TSB_2068999_4 Aug 21, 2026 · Service Bulletin/Repair Instructions
This TSB describes a corrosion issue due to outside influence and the prohibition of warranty in these cases. - TSB_2067132_4 Aug 21, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is corrosion on the friction survace of steel brake discs. - TSB_2064681_6 Aug 21, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is an issue with wireless charging/wireless charging is not working. - TSB_2063546_5 Aug 21, 2026 · Service Bulletin/Repair Instructions
This bulletin provides service infomraiton regardin gthe identifaction of noises with dynamic steering. - TSB_2063528_5 Aug 21, 2026 · Service Bulletin/Repair Instructions
This bulletin provides service information when thre are engine noises in the vehicle interior. - TSB_2059057_15 Aug 4, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informatin when there is binding or vibrations in tight turns with quattro Ultra. - TSB_2082846_1 Jul 27, 2026 · Service Bulletin/Repair Instructions
This bulletin provides a statement regarding the bottleneck of supply for VW approved oil types VW 504.00 and VW 507.00. - TSB_2082103_3 Jul 2, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informion when there is intermittently no start when using start/stop. - TSB_2081573_4 Jul 13, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when DTC B105A1A, B103E25 is stored in 0017; fuel tank level implausible. - TSB_2081573_3 Jul 2, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when DTC B105A1A, B103E25 is stored in 0017; fuel tank level implausible. - TSB_2078648_2 Jul 10, 2026 · Service Bulletin/Repair Instructions
This service information TSB provides warranty coverage information for vehicles with a broken sunroof panel. - TSB_2073747_4 Jul 9, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informatoinw hent here are scratches or a coating on the cover of the instrument cluster, or particles inside of the housing. - TSB_2073282_1 Jul 9, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is a film/visible rings on the clear glass cover of the headlight when the dipped beam is switched on. - TSB_2082323_1 Jun 10, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informaiton when the engine is not running smoothly, misfiring. - TSB_2076404_8 Jun 29, 2026 · Service Bulletin/Repair Instructions
This bulletin provides a deployment overview for customer service packages MLB and MQB for MIB3/connectivity box/OCU3/LSR. - TSB_2076404_7 Jun 1, 2026 · Service Bulletin/Repair Instructions
This bulletin provides a deployment overview for customer service packages MLB and MQB for MIB3/connectivity box/OCU3/LSR. - TSB_2074640_3 Jun 26, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is increased oil consumption; >0.5ltr/1000 km. - TSB_2073867_3 Jun 4, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when DTC U140A00 Terminal 30 is stored in the ECM. - TSB_2069331_7 Jun 23, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informaitn when there is a warning messsage; "Instrument cluster: fault. Limited warning messages. Please contact workshop"; DTC B200096. - TSB_2068573_5 Jun 4, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informaoitn when the rear parking sensor sometimes does not work, is loose, or there is a rear parking sensor fault message. - TSB_2065960_6 Jun 23, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when the display of the Audi virtual cockpit is distorted due to a broken screen. - TSB_2064983_15 Jun 22, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there are pixel faults on the virtual cockpit. - TSB_2059528_19 Jun 1, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when the Emergency call SOS light has a fault, LED red; DTC B200000. - TSB_2059335_7 Jun 23, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there are noises from the area around the instrument cluster. - TSB_2052680_6 Jun 4, 2026 · Service Bulletin/Repair Instructions
This Reporting Obligation requires technicains to contact the Technical Assistance Center (TAC) in cases where the airbag/seatbelt is deployed/not deployed; general accident information; and fire and overheat damage. - TSB_2074729_3 Jun 23, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informationwhen noises/vibration are detected from front of vehicle in dynamic mode. - TSB_2082103_2 May 26, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informion when there is intermittently no start when using start/stop. - TSB_2082103_1 May 26, 2026 · Service Bulletin/Repair Instructions
This TSB replaces Pending Service Solution (PSS) TSB 2076267: 01 PSS Engine: Starter - intermittently no restart after start stop - V6 TFS/; P06E900, P060A00. - TSB_2080517_4 May 22, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informaiotn when the starter battery is discharged or defective. - TSB_2077443_3 May 8, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when the convenience openeing does not work. - TSB_2074808_4 May 6, 2026 · Service Bulletin/Repair Instructions
The high-voltage batteries in electric vehicles are subject to various ageing effects which could lead to the energy content (energy density) being reduced. This reduction in the energy content, which is due to factors. Revised header. Added Model years - TSB_2074721_3 May 5, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is noise from the backrest of the front seat. - TSB_2067557_2 May 15, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informaiton when the windscreen/rear window washer pump is not working (B126101, B126113). - TSB_2061932_12 May 20, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informaiton when traffic jam assist is unavailable/active lane assist fault is reported in the instrument cluster. - TSB_2059057_14 May 27, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informatin when there is binding or vibrations in tight turns with quattro Ultra. - AOS-26-25 May 26, 2026 · Service Bulletin/Repair Instructions
This is a notice for software changes with the ODIS diagnostic program to correct the communication during vehicle programming function: A software fix is needed to correct the issue: The ODIS Audi Brand update 2.41.1 is setting a ODS5003E error code when … - TSB_2081722_1 Apr 22, 2026 · Service Bulletin/Repair Instructions
This bulletin is informational and contains information on the various warning lamps that may appear. - TSB_2081030_2 Apr 15, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is an abnormal engine knocking noise from the engine compartment; V6 3.0L TFSI. - TSB_2081030_1 Apr 15, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information when there is an abnormal engine knocking noise from the engine compartment; V6 3.0L TFSI. - TSB_2080517_3 Apr 30, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informaiotn when the starter battery is discharged or defective. - TSB_2070568_6 Apr 22, 2026 · Service Bulletin/Repair Instructions
This bulletin provides information about professional noise analysis with the VAS 611 015 PICO-NVH tool - TSB_2022032_12 Apr 30, 2026 · Service Bulletin/Repair Instructions
This bulletin provides diagnostic information for the vehicle locking system. - TSB_2081531_1 Mar 27, 2026 · Service Bulletin/Repair Instructions
This Reporting obligation requests that technicians contact the Technical Assistance Center (TAC) when the diagnostic tester refers to this reportin gobligation or to TPI 2033392. - TSB_2081409_1 Mar 26, 2026 · Service Bulletin/Repair Instructions
This bulletin provides informaiton regarding the Universal Traffic Recorder.
Source: NHTSA manufacturer communications files.