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Service bulletins for the 2021 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.

969 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Bulletins, newest first
CampTip_RNA_Audi2024-11-06. Other. UNKNOWN OR OTHER. Vehicle Concerns Before Recall Repair Available
A9124732064681_52024-11-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when there is an issue with wireless charging/wireless charging not working with Audi Phone Box.
A9124712074855_22024-11-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the calendar function is not available.
A9124642075322_22024-11-06. Service bulletin. ELECTRICAL SYSTEM. This Pending Service Solution (PSS) requests that technicians enter a record in the PSS Database when there is an Audi connect installation error.
A9124632075537_12024-11-06. Service bulletin. ELECTRICAL SYSTEM. This TSB provides information when DTCs U142100 and U164200 are stored as passive/sporadic in the gateway.
A9024352064983_102024-11-06. Service bulletin. ELECTRICAL SYSTEM. This TSB provides information when the Virtual cockpit has a pixel error.
A7224592074721_22024-11-06. Service bulletin. STRUCTURE:BODY. This bulletin provides information when there is noise from the backrest of the front seat.
A5724652022032_112024-11-06. Service bulletin. STRUCTURE:BODY. This bulletin provides diagnostic information regarding the locking system.
A3924752075681_12024-11-06. Service bulletin. POWER TRAIN. This bulletin provides information when there are droning noises/vibrations in tight corners, vehicles with PR number GH4 (quattro with ultra technology).
A3924732059057_122024-11-06. Service bulletin. POWER TRAIN. This bulletin provides informatin when there is binding or vibrations in tight turns with quattro Ultra.
A1524532075530_12024-11-06. Service bulletin. ENGINE. This bulletin provides informatin when the engine does not run smoothly at idling speeds.
A0124412071199_42024-11-06. Service bulletin. ENGINE. This bulletin provides information when the MIL is on P045600 Very Small Leak Detected - NVLD.
A0024942075515_12024-11-06. Service bulletin. ENGINE. This bulletin states that the use of fuel additives is not permitted.
A9624032061932_92024-10-28. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when "Audi Active Lane Assist/Traffic Jam Assist: malfunction!" is displayued, DTC U112300 is stored in one of two control modules
A9124552075322_12024-10-28. Service bulletin. ELECTRICAL SYSTEM. This Pending Service Solution (PSS) requests that technicians enter a record in the PSS Database when there is an Audi connect installation error.
A9024302058077_92024-10-28. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information about the Audi pre sense warning, warning jolt and/or brake engagement.
A9024282075217_12024-10-28. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides inormatin when the guages is faulty in the Audi virtual cockpit.
A9024272070020_42024-10-28. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information when the audi virtual cockpit display has semi-circular marks on the edges of the display.
A8724892041717_112024-10-28. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information pertaining to the GFF test plan required for A/C compressore replacements, regardless of the concern.
A6624122060333_52024-10-28. Service bulletin. STRUCTURE:BODY. This bulletin provides informaiton when the exterior black optic trim is discolored.
A5124312068999_22024-10-28. Service bulletin. STRUCTURE:BODY. This bulletin provides information when there is visible corrosion at the joint between the roof and roof side member.
A4824742055733_52024-10-28. Service bulletin. STEERING. This bulletin provides informatin when there is a squeaking noise from the rubber boot of the intermediate steering shaft.
A4824732075199_12024-10-28. Service bulletin. STEERING. This bulletin provides information when there is a prompt to take over steering; hands off detection.
A4824722028220_122024-10-28. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information regarding steering wheel visual damage.
A4624592069078_22024-10-28. Service bulletin. SERVICE BRAKES. This bulletin provides informaion regarding zirconium inserts in the bake piston for vehicle equipped with ceramic brakes.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.