2018 Audi A4 Service and Repair Manual

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Covers all 2018 A4 trims — Prestige Sedan 4-Door, Select Sedan 4-Door, Premium Sedan 4-Door +5 more ·
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2018 Audi A4 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
  • Select Sedan 4-Door
  • Premium Sedan 4-Door
  • S Line Sedan 4-Door
  • Progressiv Sedan 4-Door
  • Premium Plus Sedan 4-Door
  • Dynamic Sedan 4-Door
  • Komfort Sedan 4-Door

Engines covered

  • 2.0L 1984CC 121Cu. In. l4 GAS DOHC Turbocharged

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
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 #11033492

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

TSB #11033475

The high-voltage batteries in electric vehicles are subject to various ageing effects which could lead to the energy content (energy density) being reduced. This reduction in the energy content, which is due to factors. Revised header. Adde

TSB #11033474

This bulletin provides information when there are noises after selecting a ear while idling and the vehicle is stationary, or while driving.

TSB #11033465

This bulletin provides informatin when there is binding or vibrations in tight turns with quattro Ultra.

TSB #11033457

This is a notice for software changes with the ODIS diagnostic program to correct the communication during vehicle programming function: A software fix is needed to correct the issue: The ODIS Audi Brand update 2.41.1 is setting a ODS5003E

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.

Showing the 8 most recent of 730 technical service bulletins on file with NHTSA.

20240125Component: STEERINGCrash reported

I was rear-ended at a slow speed. I was stopped at the time. The driver who hit me was decelerating hard. Damaged to rear bumper. When I got back in the car, I realized that telescoping steering colu

20260212Component: ENGINE AND ENGINE COOLING

The contact owned a 2018 Audi A4. The contact stated that while driving at an undisclosed speed, there was fluid leaking from the front of the vehicle. No warning lights were illuminated. The contact

20260107Component: BACK OVER PREVENTION: REARVIEW SYSTEM BRAKING

This problem is extremely sporadic, and often remedies itself after car shut down, and sometimes require that the car sit for a period of time. I estimate the following issue happens ~1 time a month,

20260107Component: ELECTRICAL SYSTEM

This problem is extremely sporadic, and often remedies itself after car shut down, and sometimes require that the car sit for a period of time. I estimate the following issue happens ~1 time a month,

20260107Component: UNKNOWN OR OTHER

This problem is extremely sporadic, and often remedies itself after car shut down, and sometimes require that the car sit for a period of time. I estimate the following issue happens ~1 time a month,

Showing the 5 most serious of 36 complaints filed with NHTSA.

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