2018 Audi S4 Service and Repair Manual

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Factory-Grade Data

2018 Audi S4 service and repair manual a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.

What's included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Wiring diagrams and electrical sections
  • Powertrain, brakes, steering, suspension, HVAC and more

Trims covered

  • Prestige Sedan 4-Door
  • Base Sedan 4-Door
  • Progressiv Sedan 4-Door
  • Premium Plus Sedan 4-Door
  • Technik Sedan 4-Door

Engines covered

  • 3.0L 2995CC V6 GAS DOHC Turbocharged
  • 3.0L 2995CC V6 GAS DOHC Supercharged

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

2018 Audi S4 Recalls & Complaints

NHTSA #19V54700024/07/2019Component: AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE

Volkswagen Group of America, Inc. (Audi) is recalling certain 2018-2019 Audi RS5 Sportback, 2018 S5 Cabriolet, S5 Sportback, S5 Coupe, S4 Sedan, A5 Cabriolet, A5 Sportback, A5 Coupe, and 2017-2018 A4

Consequence

A disabled passenger air bag increases the risk of injury in the event of a crash.

Remedy

Audi will notify owners, and dealers will install cable ties to the harness, free of charge. The re

NHTSA #21V87400010/11/2021Component: SEATS

Volkswagen Group of America, Inc. (Audi) is recalling certain 2017-2020 A4 Allroad, A4 Sedan, 2018-2019 RS5 Coupe, 2019 RS5 Sportback, 2018-2020 A5 Cabriolet, A5 Coupe, A5 Sportback, S4 Sedan, S5 Cabr

Consequence

A disabled passenger air bag increases the risk of injury in the event of a crash.

Remedy

Dealers will replace the connecting cable and either the heating mat or entire seat cover, free of c

TSB #11032174

This bulletin provides information when there is an abnormal engine knocking noise from the engine compartment; V6 3.0L TFSI.

TSB #11032173

This bulletin provides information when there is an abnormal engine knocking noise from the engine compartment; V6 3.0L TFSI.

TSB #11032165

This bulletin provides informaiotn when the starter battery is discharged or defective.

TSB #11032137

This bulletin provides information about professional noise analysis with the VAS 611 015 PICO-NVH tool

TSB #11032131

This bulletin provides diagnostic information for the vehicle locking system.

TSB #11031064

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 #11031053

This bulletin provides informaiton regarding the Universal Traffic Recorder.

TSB #11031051

This bulletin provides informaiotn about various infortainment system complaints.

Showing the 8 most recent of 755 technical service bulletins on file with NHTSA.

20250606Component: ENGINE

Water pump defect for the 3.0L ea839 turbo engine found across many Porsche and Audi models. Defect causes damage to vacuum lines, thermostat, and can eventually lead to engine failure if not resolved

20250313Component: ENGINE

My 2018 Audi S4 has a catastrophic engine failure issue and this is common with the EA839 engine. There is a knocking in the motor that is caused by internal engine parts (rocker arms needle bearings)

20240407Component: ENGINE

PCV housing and lines failed. Caused pressure to build up thus shooting off the oil cap shooting oil everywhere! in addition to that it is a huge fire hazard considering the turbo is right next to it.

20221220Component: SUSPENSION

Audi Dealer inspection revealed Rear spring is broken and mounts are deteriorating. Dealer states not common and would result in accident if not repaired. Research indicates broken springs common wi

20180409Component: SERVICE BRAKES

THE VEHICLE'S PRE SENSE AUTO-BRAKING AND BRAKING ALERT JOLT HAS BEEN ACTIVATING ERRONEOUSLY AND HAVE ALMOST CAUSED ACCIDENTS AT SPEED. THE SYSTEM CANNOT BE PERMANENTLY DISABLED, IT DEACTIVATES UPON I

Showing the 5 most serious of 9 complaints filed with NHTSA.

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