Service bulletins for the 2020 Audi S4
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
942 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
| A4321472051336_4 | 2021-07-02. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains repair instructions for DTC B200FF0. |
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| A9121052061933_2 | 2021-06-03. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). This bulletin contains an explanation and troubleshooting for the Navigation messages in the instrument cluster. |
| A9121042024323_8 | 2021-06-03. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SOFTWARE. This bulletin contains technical information regarding when the parking aid sporadically warns of obstacles that don't exist or it is inoperative/constant warning. |
| A6921662063398_1 | 2021-06-03. Service bulletin. SEAT BELTS. This informational bulletin outlines what is damage due to outside influence on a seat belt. |
| A9021032058077_5 | 2021-06-03. Service bulletin. EQUIPMENT; SERVICE BRAKES. This bulletin contains instructions for determining unexpected Audi presense interventions. |
| A1021222018288_9 | 2021-06-03. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. This technical service bulletin reminds the reader to check for metal debris when replacing an engine. |
| A0021442052680_3 | 2021-06-03. Service bulletin. EQUIPMENT. This bulletin contains instructions for additional reporting requirements for safety related inquiries (airbag/seatbelts, accidents, fire and overheat damage). |
| A6421802020552_1 | 2021-06-03. Service bulletin. VISIBILITY:GLASS, SIDE/REAR. This bulletin provides instructions on how to clean exterior glass. |
| A4821002061904_2 | 2021-06-03. Service bulletin. STEERING:STEERING CONTROL MODULE. This bulletin contains repair instruction for when DTC C110DF0 is stored and the yellow steering lamp is on. |
| A4421822056386_5 | 2021-06-03. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY:VEHICLE CONTROLS:STEERING. This bulletin contains instructions for when the vehicle pulls to one side or the steering wheel is crooked. |
| ELSAallignAudi | 2021-05-06. Service bulletin. ELECTRICAL SYSTEM. Elsa2Go campaign information is now 100% aligned with ElsaPro. This update to Elsa2Go ensures that both systems are displaying the same campaign information, including OPEN/CLOSED status, repair date as well as criterions at the same time without any discrepancy. |
| A9121932061505_2 | 2021-05-06. Service bulletin. EQUIPMENT. This bulletin states to create a PSS record when the HomeLink Garage Door Opener is grayed out while driving and the message "For your safety, this function is not available while driving" is displayed when "clicking" on it. The geolocation feature does not work either. |
| A9021982059335_2 | 2021-05-06. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. This bulletin contains information on noises from the instrument cluster installation area. |
| A9021002032113_5 | 2021-05-06. Service bulletin. EQUIPMENT. This information bulletin contains a background on the outside air temperature reading. |
| A9021992063038_1 | 2021-05-06. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. This informational bulletin explains why the version information pops-up. |
| A4821972063041_1 | 2021-05-06. Service bulletin. STEERING. This buletin contains a software update when there is a red steering warning lamp and DTC B200000 is stored. |
| A6421792047061_3 | 2021-05-06. Service bulletin. EQUIPMENT:OTHER:LABELS. This bulletin contains a cleaning procedure from leftover residue from suction cups or labels. |
| A9121882062115_4 | 2021-05-06. Service bulletin. EQUIPMENT; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). This bulletin contains instructions for when the nav files are corrupted during an update. |
| A5721752022032_9 | 2021-05-06. Service bulletin. LATCHES/LOCKS/LINKAGES; ELECTRICAL SYSTEM. This technical service bulletin provides troubleshooting information for the vehicle locking system. |
| A5521542062730_1 | 2021-05-06. Service bulletin. EQUIPMENT. This bulletin explains why the compartment lid cannot be closed using the buttons on the key sometimes. |
| A9121862062713_1 | 2021-04-06. Service bulletin. EQUIPMENT. This bulletin contains repair instructions for when there is radio static when the rear heater is active. |
| A5521532062669_1 | 2021-04-06. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin states that this is a normal condition and to not perform any repairs. |
| A0121012054893_5 | 2021-04-06. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin contains instructions for documenting the "Please reduce Oil Level" message in the instrument cluster potentially with an Engine Warmup request. |
| A9421362023322_3 | 2021-04-06. Service bulletin. EXTERIOR LIGHTING. This informational bulletin contains information on the different shading of LED headlights. |
| A8021112062583_1 | 2021-04-06. Service bulletin. EQUIPMENT. This bulletin contains instructions for addressing an insufficient or uneven heating performance from the HVAC system. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.