Service bulletins for the 2019 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.
836 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
| SM 05-2021 | 2021-02-04. Service bulletin. EQUIPMENT. This special notice is to inform dealers to return the parts listed if it meets the criteria provided. |
|---|---|
| A9121642024323_7 | 2021-02-04. Service bulletin. PARKING BRAKE:ELECTRICAL:CONTROL MODULE. This bulletin contains technical information regarding when the parking aid sporadically warns of obstacles that don't exist or it is inoperative/constant warning. |
| A1921112061918_1 | 2021-02-04. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides guidance on diagnosing a coolant light concern with normal coolant level in the tank. |
| A6621682046229_2 | 2021-02-04. Service bulletin. STRUCTURE. This informational bulletin outlines proper warranty procedure for optical defects. |
| A4821922061904_1 | 2021-02-04. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM. This bulletin contains repair instruction for when DTC C110DF0 is stored and the yellow steering lamp is on. |
| A0121962060429_2 | 2021-02-04. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin contains instructions for when there may be a noise from the exhaust flap or there are DTCs sporadically stored in the ECM. |
| A5320042043016_2 | 2021-01-08. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM: CABLES; EQUIPMENT. This bulletin contains repair instructions for when cables are hanging in view with no DTCs. |
| A5520512014055_8 | 2021-01-08. Service bulletin. EQUIPMENT; ENGINE; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin contains instructions for addressing discoloration due to moisture on a new vehicle. |
| A3920382060169_2 | 2021-01-08. Service bulletin. ELECTRICAL SYSTEM. This bulletin contains instructions for when DTC U101300 is logged with sports differential warning lamps or messages. |
| A3920392051558_5 | 2021-01-08. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin contains repair instructions for when the message "four-wheel drive malfunction" shows up sporadically in the instrument cluster with DTC C05ED00. |
| SM C-2020 | 2021-01-08. Service bulletin. EQUIPMENT. This special notice is to inform dealers to return the part numbers listed (State of California only). |
| A0020362002047_1 | 2020-12-21. Service bulletin. EQUIPMENT:ELECTRICAL. This information bulletin contains instructions for technicans on how to ensure their TAC call goes smoothly. |
| A9120392061490_1 | 2020-12-04. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION. This bulletin covers Audi connect: oil level in the myAudi app is implausible |
| A4620192061331_1 | 2020-12-04. Service bulletin. SERVICE BRAKES, AIR:ANTILOCK:ABS WARNING LIGHT; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains instructions for addressing an ABS warning light with DTCs C050200 and/or C050800. |
| A4620182061403_1 | 2020-12-04. Service bulletin. SERVICE BRAKES, AIR:DISC:PADS; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains instructions for addressing a brake pad wear indicator light with no DTCs. |
| A912029205607610 | 2020-12-04. Service bulletin. COMMUNICATION:MANUFACTURER TELEMATICS; ELECTRICAL SYSTEM; EQUIPMENT. This bulletin contains instructions for when there is no diagnostics communication with the ConBox. |
| 2010-2021EngOil | 2020-12-04. Service bulletin. EQUIPMENT. Added Saga Part number for 0W40 oil: SAGA Part: G E55040S0 |
| A1020202059446_3 | 2020-11-05. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING. This bulletin contains repair instructions for oil loss found in the engine compartment. |
| A9120242026611_7 | 2020-11-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin contains a guide for troubleshooting HD radio issues. |
| A4820912053869_4 | 2020-11-05. Service bulletin. STEERING:STEERING WHEEL /HANDLE BAR:HAND HEATER/COOLER. This bulletin contains repair instructions for when DTC B145504 with symptom code 7340800. |
| A9020772048926_9 | 2020-11-05. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin contains repair instructions for DTC B200FF1 and B200FF2. |
| A9120222055945_5 | 2020-11-05. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin contains repair instructions for when the warning message 'SOS Emergency call function deactivated' is seen in the instrument cluster. |
| A6620672060333_2 | 2020-11-05. Service bulletin. EQUIPMENT; STRUCTURE:BODY. This bulletin contains instructions for when the black optic trim is discolored. |
| Dealer 24FG | 2020-11-05. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). The updated software improves drivability and increases diagnostic robustness. |
| Bulletin 24FG | 2020-11-05. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:ADAS:HUD:SOFTWARE. The updated software improves drivability and increases diagnostic robustness. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.