2008 Audi A8 Quattro Service and Repair Manual

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Covers all 2008 A8 Quattro trims — L Plus Sedan 4-Door, Base Sedan 4-Door, L Sedan 4-Door +1 more ·
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2008 Audi A8 Quattro 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

  • L Plus Sedan 4-Door
  • Base Sedan 4-Door
  • L Sedan 4-Door
  • Plus Sedan 4-Door

Engines covered

  • 4.2L 4172CC V8 GAS DOHC Naturally Aspirated
  • 4.2L 4163CC V8 GAS DOHC Naturally Aspirated
  • 6.0L 5998CC 366Cu. In. W12 GAS DOHC Naturally Aspirated

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 #16V41500009/06/2016Component: VISIBILITY:SUN/MOON ROOF ASSEMBLY

Volkswagen Group of America, Inc. (Volkswagen) is recalling certain model year 2007-2009 Audi A8 and S8 vehicles. The sunroof glass on the affected vehicles may not be properly secured to the sunroof frame. As a result, the sunroof glass may detach from the car while driving.

Consequence

If the glass detaches from the sunroof frame it could be come a road hazard, increasing the risk of a crash.

Remedy

Volkswagen will notify owners, and dealers will install additional adhesive between the sunroof glass and frame, free of charge. The recall is expected to begin in August 4, 2016. Owners may contact Audi customer service at 1-800-253-2834. Volkswagen's number for this recall is 60C3.

TSB #11002234

This bulletin provides information when the exterior trunk handle is inoperative.

TSB #11002134

This bulletin provides information when the exterior trunk handle is inoperative.

TSB #10250322

This bulletin provides information pertaining to MMI Navigation database concerns.

TSB #10248208

This bulletin provides information when the parking assistance provides false warnings.

TSB #10246152

This bulletin provides general information about the outside air temperature reading.

TSB #10245285

This bulletin provides information on the VAS 611 015 PICO-NVH tool for professional noise analysis.

TSB #10244595

This bulletin provides information pertaining to when there are foreign objects inside of a headlight or taillight.

TSB #10244517

This bulletin provides damage assessment guidelines for textile seat covers.

Showing the 8 most recent of 312 technical service bulletins on file with NHTSA.

05/25/20Component: AIR BAGS,STRUCTURECrash reported

THE 2008 AUDI A8L WAS INVOLVED IN A ROLLING REAR-END COLLISION WHILE STARTING TO MOVE AT A STOP SIGN. VELOCITY WAS LESS THAN 5 MPH. MINOR COLLISION WITH NO DEPLOYMENT OF AIRBAGS AND NO DAMAGE TO THE CAR AHEAD. THE A8L DROVE NORMALLY AFTER THE COLLISION. INSPECTION AT THE BODY SHOP REVEALED STRESS FRACTURE AND BENDING OF THE FRAME. CAR WAS DECLARED A TOTAL LOSS. IT IS UNACCEPTABLE THAT A FULL SIZE PREMIUM SEDAN SHOULD SUFFER CATASTROPHIC FAILURE OF THE FRAME AT A LOW SPEED COLLISION. A HIGH SPEED COLLISION WOULD HAVE PROVIDED NO PROTECTION TO THE OCCUPANTS OF THE VEHICLE. MULTIPLE CONTACTS MADE

09/29/20Component: VEHICLE SPEED CONTROLCrash reported

TL. HI, THIS MORNING I WAS INVOLVED IN AN ACCIDENT WHEN MY 2008 AUDI A8L SUDDENLY ACCELERATED OUT OF CONTROL AS I WAS ENTERING A PARKING GARAGE. THANKFULLY IT APPEARS NO ONE WAS INJURED. I AM EXTREMELY DISTURBED BY THIS INCIDENT. I HAVE ALSO CONTACTED AUDI USA. IS THUS A KNOWN PROBLEM WITH THIS CAR? PLEASE LET ME KNOW WHAT I SHOULD DO. I DON'T WANT THIS TO HAPPEN TO ANYONE ELSE AND I DO NOT KNOW IF I SHOULD ESCALATE THIS ISSUE SOMEWHERE ELSE. I AM ALSO CONCERNED ABOUT DRIVING IT AGAIN AFTER IT IS REPAIRED. I ALWAYS LIKED THE CAR AND IF I DON'T DRIVE IT AGAIN I COULD NOT IN GOOD CONSCIOUS SELL

12/09/20Component: ENGINE

TL* THE CONTACT OWNS A 2008 AUDI A8. WHILE THE VEHICLE WAS IN USE, THE CHECK ENGINE WARNING INDICATOR ILLUMINATED. THE VEHICLE WAS TAKEN TO AUDI PITTSBURGH (2050 LIBERTY AVE, PITTSBURGH, PA 15222, (412) 245-4200) WHERE IT WAS DIAGNOSED THAT THE MASSIVE AIR FLOW SENSORS FAILED AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPLACED, BUT THE FAILURE RECURRED MULTIPLE TIMES WITH AN ABNORMAL VACUUM NOISE COMING FROM THE ENGINE. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND DID NOT ASSIST. THE FAILURE MILEAGE WAS APPROXIMATELY 119,000.

06/04/20Component: AIR BAGS

TAKATA RECALL - I JUST RECEIVED WORK ONLINE THROUGH CREDIT KARMA THAT MY CAR HAS A RECALL ON IT DATING BACK TOWARDS 2016. I FINANCED THIS CAR IN 2015. THE CAR HAS BEEN FINE, FOR THE MOST PART ASIDE FROM SMALL ELECTRICAL ISSUES.. HOWEVER MY BIGGEST COMPLAINT SAYS THIS RECALL IS BECAUSE THE AIRBAGS ARE PRONE TO EXPLODING CAUSING METAL SHRAPNEL TO FLY AND CAUSE HEAVY DAMAGE AND POSSIBLY DEATH TO THE PEOPLE IN THE CAR. IN SOME CASES IT SEEMS THE AIRBAGS WILL NOT WORK AT ALL BECAUSE OF POSSIBLE HEAT RUINING THE PARTS THE CAUSE THE AIRBAG TO WORK.

12/31/20Component: POWER TRAIN

I OWN A 2008 AUDI A8 WITH ABOUT 48200 MILES. IT IS GREAT VEHICLE BUT HAVING PROBLEMS WITH TRANSMISSION DURING DRIVING. UNDER LOAD IT WILL GO IN FAIL SAFE MODE AROUND 4,5,6 GEARS. IT IS CAUSING DANGEROUS SITUATIONS AS CAR STARTS STOPPING SUDDENLY AND CAUSING DRIVER MOMENTARILY LOOSE CONTROL OF A VEHICLE. THIS IISSUE WAS BROUGHT UP TO A AUDI BUT THEY SAID IT IS PAST WARRANTY. BY DOING AN INDEPENDENT RESEARCH, IT WAS FOUND THAT THERE IS ONE SINGLE TEFLON SEAL CONTROLLING FLUID PRESSURE FOR A CLUTCH E.THAT SEAL WEARS OUT PREMATURELY CAUSING FLUID TO LOOSE PRESSURE AND FAILING SAFE TRANSMISSION. IN

10/27/20Component: AIR BAGS

TAKATA RECALL. MY PASSENGER AIRBAG WAS RECALLED IN JANUARY, 2017. TEN MONTHS HAVE PASSED WITH NO REPLACEMENT PART OR SOLUTION AND WAS INSTEUCTED NOT TO HAVE PASSENGERS IN THE FRONT SEAT. HOW LONG AM I SUPPOSED TO WAIT?

12/10/20Component: POWER TRAIN

AUTOMATIC TRANSMISSION GOING INTO FAIL SAFE MODE DURING DRIVING AROUND 4,5,6 GEARS WHEN GOING AROUND 70+ MPH AND RELEASE GAS PEDAL AND APPLYING GAS AGAIN IN ORDER TO PASS VEHICLE. CAR GOES INTO FAIL SAFE MODE, NEEDS TO BE PULLED OVER TO RESTART AND RESET TRANSMISSION. CAR WAS TAKEN TO A AUDI DEALER FOR AN INSPECTION AND BY TECHNICIAN AT FLUID LEVEL WAS LOW. TOP UP TRANS FLUID . WAS DRIVING OK FOR TWO WEEKS , PROBLEM STARTED AGAIN. TOOK CAR BACK TO A DEALER, TECHNICIAN CALLED AN AUDI SUPPORT CENTER. BY AUDI SUPPORT CENTER WAS RECOMMENDED TO REPLACE ATF FILTER WITH OPTIMIZED ATF FILTER. REASON F

09/09/20Component: VEHICLE SPEED CONTROL,SERVICE BRAKES

TL* THE CONTACT OWNS A 2008 AUDI A8. THE CONTACT STATED THAT THE VEHICLE HESITATED TO ACCELERATE AND THE BRAKE PEDAL FAILED TO RESPOND WHEN DEPRESSED. THE VEHICLE WAS TAKEN TO THE DEALER, BUT THE FAILURE COULD NOT BE DUPLICATED. THE MANUFACTURER WAS NOT NOTIFIED. THE VIN AND FAILURE MILEAGE WERE NOT AVAILABLE.

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