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Service bulletins for the 2013 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.

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

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Only bulletins with component: Power steering are shown. Show all

Bulletins, newest first
A481336 2033044-2017-11-17. Service bulletin. STEERING; STEERING:ELECTRIC POWER ASSIST SYSTEM. The customer states they have a comfort concern about the steering system. The steering works correctly but intermittently feels notchy. There is no loss of steering functionality. The concern may be more apparent in colder weather, and may improve with warmth or an ignition key cycle. No DTC is stored and no warning appears in the cluster. This PSS TSB applies only to the comfort concern described in the condition of this PSS TSB. Please refer to the attached Information and Q&A document for guidance when handling each case. A solution is in development and will be made available as soon as possible. The steering wheel is mechanically linked to the wheels of the vehicle, and there is no loss of steering functionality. Refer to the attached Information and Q&A document for guidance when handling each case.
A481338 2033044-2017-11-17. Service bulletin. STEERING:ELECTRIC POWER ASSIST SYSTEM; STEERING. Supersedes Technical Service Bulletin Group 48 number 13-36 dated February 21, 2013. The customer states they have a comfort concern about the steering system. The steering works correctly but intermittently feels notchy. There is no loss of steering functionality. The concern may be more apparent in colder weather, and may improve with warmth or an ignition key cycle. No DTC is stored and no warning appears in the cluster. This PSS TSB applies only to the comfort concern described in the condition of this PSS TSB. Please refer to the attached Information and Q&A document for guidance when handling each case. A solution is in development and will be made available as soon as possible.The steering wheel is mechanically linked to the wheels of the vehicle, and there is no loss of steering functionality. Refer to the attached Information and Q&A document for guidance when handling each case.
A481341 2033391-2017-11-17. Service bulletin. STEERING:ELECTRIC POWER ASSIST SYSTEM; ELECTRICAL SYSTEM:SOFTWARE. Customer may report that a warning for electromechanical steering is displayed in the instrument cluster. There is no loss of steering control or functionality associated with these warnings. Issues with the hardware and software.
A971335 2033412-2017-11-17. Service bulletin. STEERING:ELECTRIC POWER ASSIST SYSTEM; STEERING. Steering wheel lock does not work. Various warning lights are on. Steering feels stiffer than usual. The engine cannot be switched off. The ignition key cannot be removed. DTC with description "Brake control unit, no signal/communication" is present in several control units. DTC entry in ABS Control unit, J104 (03). One or more may be present. This condition does not result in any drivability concerns. The steering system is fully connected. This condition does not result in any drivability concerns. The steering system is fully connected. The insulation for the ABS wheel speed sensor is damaged in production. Over time, this can lead to corrosion on the wires and restricted functions with the ABS control module. Only the wires in the left bulkhead grommet are affected.
Executive Servic2017-10-27. Service bulletin. SERVICE BRAKES, HYDRAULIC:FLUID; STEERING:HYDRAULIC POWER ASSIST:POWER STEERING FLUID; POWER TRAIN; ENGINE AND ENGINE COOLING; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This document contains a fluid capacity chart as well as a chart that contains the parts and part numbers needed for service.
SB-1120122016-05-23. Service bulletin. STEERING:ELECTRIC POWER ASSIST SYSTEM. SUMMARY TO BE PROVIDED ON A FUTURE DATE.

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