2005-2011 Audi A6 Repair Manual

Table of Contents : 2005-2011 Audi A6 Repair Manual

A- Workshop Repair Manual

• Maintenance (Edition 05.2017).
• Maintenance (Edition 11.2015).
• Technical Data For Engines.
• 4-Cyl. Direct Petrol Injection Engine (2.0L. 4-Valve Turbo), Mechanics BPJ BYK.
• 4-TDI Unit Injector Engine (2.0L. 4-Valve), Mechanics BLB BNA BRE BRF BVG.
• 4-Cyl. TDI Engine (2.0L. 4-Valve Common Rail), Mechanics CAGB CAHA CAHB.
• 6-Cyl. Direct-Injection Engine With A Supercharger (3.0L. 4-Valve Tfsi), Mechanics CAJA CCAA.
• 6-Cyl. Direct Petrol Injection Engine (3.2L. 4-Valve), Mechanics BKH AUK BYU.
• 6-Cyl. Injection Engine (2.4L. 4-Valve), Mechanics Bdw.
• 6-Cyl. Direct Injection Engine (2.8L. 4-Valve), Mechanics BDX CCDA CCEA.
• 6-Cyl. TDI Engine (2.7L._ 3.0L. 4-Valve Common Rail, Eu5), Mechanics.
• 6-Cyl. TDI Engine (2.7L._ 3.0 Ltr. 4-Valve Common Rail), Mechanics BMK BNG BPP BSG ASB.
• 6-Cyl. Injection Engine (3.0 Ltr. 5-Valve), Mechanics Bbj.
• 8-Cyl. Direct Petrol Injection Engine (4.2 Ltr. 4-Valve), Mechanics BVJ.
• 8-Cyl. Engine (4.2L. 5-Valve With Timing Chains), Mechanics BAT BNK.
• 10-Cyl. Direct Petrol Injection Engine (5.0L. 4-Valve Turbo Rs6), Mechanics BUH.
• 10-Cyl. Direct Petrol Injection Engine (5.2L. 4-Valve), Mechanics BXA.
• TDI Injection And Glow Plug System (4-Cyl. 2.0L. 4-Valve Cr) CAGB CAHA CAHB.
• TDI Injection And Glow Plug System (4-Cyl. 2.0L. Unit Injector, 4-Valve) BLB BNA BRE BRF BVG.
• TDI Injection And Glow Plug System (6-Cyl. 2.7 Ltr., 3.0 Ltr. 4-Valve Common Rail).
• Direct Petrol Injection And Ignition System (10-Cyl. 5.0L. 4-Valve Turbo) BUH.
• Direct Injection And Ignition System (6-Cyl. 2.8L. 4-Valve) BDX CCDA CCEA.
• Direct Petrol Injection And Ignition System (10-Cyl. 5.2L. 4-Valve) BGS BXA.
• Direct Petrol Injection And Ignition System (4-Cyl. 2.0L. 4-Valve Turbo) BPJ BYK.
• Direct Petrol Injection And Ignition System (8-Cyl. 4.2L. 4-Valve) BVJ.
• Injection And Ignition System (6-Cyl. 3.0L. Injection Engine) Avk BBJ.
• Injection And Ignition System (8-Cyl. 5-Valve Injection Engine) BAT BNK.
• Simos Direct Injection And Ignition System (6-Cyl. 3.0L. Tfsi 4-Valve) CAJA CCAA.
• Simos Direct Petrol Injection And Ignition System (6-Cyl. 3.2L. 4-Valve With Avs) CALA.
• Simos Direct Petrol Injection And Ignition System (6-Cyl. 3.2L. 4-Valve) AUK BKH BYU.
• Simos Injection And Ignition System (6-Cyl. 2.4 Ltr.) BDW.
• Fuel Supply System, Diesel Engines.
• Fuel Supply System, Petrol Engines.
• 6-Speed Manual Gearbox 01X, Front-Wheel Drive.
• 6-Speed Manual Gearbox 02X, Four-Wheel Drive.
• 6-Speed Manual Gearbox 0A2, Front-Wheel Drive.
• 6-Speed Manual Gearbox 0A3, Four-Wheel Drive.
• Automatic Gearbox 09E, Four-Wheel Drive.
• Automatic Gearbox 09L, Four-Wheel Drive.
• Multitronic 01J, Front-Wheel Drive.
• Multitronic 0An, Front-Wheel Drive.
• Servicing 6-Speed Manual Gearbox 0A2, Front-Wheel Drive.
• Servicing 6-Speed Manual Gearbox 0A3, Four-Wheel Drive.
• Servicing Automatic Gearbox 09E, Four-Wheel Drive.
• Servicing Automatic Gearbox 09L, Four-Wheel Drive.
• Servicing Multitronic 01J And 0An.
• Rear Final Drive 01R.
• Rear Final Drive 08V.
• Rear Final Drive 0AR.
• Running Gear, Front-Wheel Drive And Four-Wheel Drive.
• Wheeltyre Guide (Edition 10.2019).
• Wheeltyre Guide (Edition 01.2019).
• Wheels And Tyres.
• Brake System.
• Air Conditioner.
• Auxiliary Heater.
• Air Conditioner With Refrigerant R134A.
• Trailer Operation Guide.
• Communication.
• Fitting Instructions Radio Communication Systems.
• Fitting Instructions Retrofitting Key-Operated Switch To Deactivate The Airbag.
• General Body Repairs.
• Body Repairs.
• General Body Repairs, Exterior.
• General Body Repairs, Interior.
• Electrical System_ General Information.
• Electrical System.
• Electrical Wiring Diagrams

• Electrical Wiring Diagrams From Model 2005.

Sample Pages

2005–2011 Audi A6 (C6) Comprehensive Guide

Overview

The 2005–2011 Audi A6 (C6 generation) is a midsize luxury sedan that offered German engineering, refined styling, and advanced technology. Available as a sedan or Avant (wagon), it competed in the premium executive sedan segment with sophisticated design and Quattro all-wheel drive capability.

Technical Specifications

Engines Available:

• 2.0T (2006–2011): 2.0L turbocharged I4, 211 hp, 258 lb-ft torque
• 3.2 FSI (2005–2010): 3.2L V6, 255 hp, 243 lb-ft torque
• 4.2 FSI (2007–2011): 4.2L V8, 350 hp, 325 lb-ft torque
• S6 (2007–2011): 5.2L V10, 435 hp, 398 lb-ft torque
• Diesel (select markets): 2.7L/3.0L TDI V6

Transmissions:

• 6-speed manual (rare, 2.0T only)
• CVT (Multitronic, FWD models)
• 6-speed Tiptronic automatic
• 7-speed S tronic dual-clutch (later models)

Drivetrain:

• Front-wheel drive (FWD) – base models
• Quattro all-wheel drive (AWD) – most models

Dimensions:

• Length: 193.5 inches
• Wheelbase: 114.2 inches
• Width: 73.8 inches
• Height: 57.9 inches
• Cargo: 14.1 cubic feet

Performance:

• 0-60 mph: 5.4–8.5 seconds (depending on engine)
• Fuel economy: 17–28 mpg (combined, depending on engine)
• Towing capacity: Up to 4,400 lbs (with proper equipment)

Standard Features:

• Leather seats
• Power front seats
• Dual-zone climate control
• Wood trim
• Bluetooth (later years)
• Xenon headlights (premium trims)

10 Top Mechanical & Electrical Issues

1. Timing Chain Tensioner Failure (3.2 V6)

• • Symptoms: Rattling noise on cold start, rough idle, check engine light, potential catastrophic engine failure
  • Root Cause: Factory timing chain tensioners wear prematurely, causing chain slack and potential timing jump
  • Fix: Replace timing chain, tensioners, guides, and related components
  • Cost: $2,500–$4,500

2. Carbon Buildup on Intake Valves (Direct Injection Engines)

• • Symptoms: Rough idle, misfires, loss of power, poor fuel economy, hesitation during acceleration
  • Root Cause: Direct injection design prevents fuel from cleaning intake valves, causing carbon deposits
  • Fix: Walnut blasting or chemical cleaning of intake valves
  • Cost: $400–$800

3. Multitronic CVT Transmission Failure

• • Symptoms: Shuddering, slipping, delayed engagement, transmission overheating, complete failure
  • Root Cause: CVT design weakness, inadequate fluid servicing, metal chain wear
  • Fix: Transmission rebuild or replacement; regular fluid changes can extend life
  • Cost: $4,000–$8,000 (replacement)

4. Oil Consumption Issues

• • Symptoms: Low oil warnings, blue smoke from exhaust, frequent oil top-ups (1 quart per 1,000 miles or more)
  • Root Cause: Worn piston rings, valve stem seals, PCV system issues, design tolerances
  • Fix: Engine rebuild with updated pistons/rings, or live with frequent oil top-ups
  • Cost: $5,000–$10,000 (rebuild); $50–$100/month (oil top-ups)

5. Air Suspension Failure

• • Symptoms: Suspension warning light, uneven vehicle height, compressor running constantly, sagging corners
  • Root Cause: Air spring leaks, compressor wear, valve block failures, sensor issues
  • Fix: Replace air springs, compressor, or convert to conventional coil springs
  • Cost: $800–$2,500 per air spring; $1,500–$2,500 (compressor); $1,500–$3,000 (coil conversion)

6. Ignition Coil and Spark Plug Failures

• • Symptoms: Misfires, rough running, check engine light, reduced performance, poor fuel economy
  • Root Cause:Ignition coils are wear items; carbon buildup exacerbates the problem
  • Fix: Replace all ignition coils and spark plugs as a set
  • Cost: $600–$1,200

7. Thermostat and Coolant Issues

• • Symptoms: Overheating, erratic temperature gauge, poor heater performance, coolant leaks
  • Root Cause: Plastic thermostat housing cracks, water pump failures, coolant flange leaks
  • Fix: Replace thermostat, housing, and related coolant components
  • Cost: $400–$1,000

8. Electronic Parking Brake Failure

• • Symptoms: Warning lights, brake won’t engage/disengage, grinding noise, emergency brake stuck
  • Root Cause:Caliper motor failures, module issues, cable stretch, corrosion
  • Fix: Replace rear brake calipers with integrated motors
  • Cost: $800–$1,500 per side

9. MMI (Multi Media Interface) System Failures

• • Symptoms: Screen goes blank, system freezes, navigation errors, no audio, unresponsive controls
  • Root Cause:Software glitches, control unit failures, screen backlighting issues, DVD drive problems
  • Fix: Software updates, control unit replacement, or screen replacement
  • Cost: $500–$2,500

10. Window Regulator Failures

• • Symptoms: Slow window operation, windows falling into door, clicking noises, windows won’t move
  • Root Cause:Plastic regulator components break, cable frays, motor wear
  • Fix: Replace window regulator assembly
  • Cost: $300–$600 per window

Top 5 Competitors (2005–2011)

1. BMW 5 Series (E60/E61) – Sportier handling, similar luxury, comparable reliability issues
2. Mercedes-Benz E-Class (W211/W212) – Main German rival, more conservative styling, air suspension issues
3. Lexus GS – Superior reliability, less engaging driving dynamics, strong resale value
4. Acura RL/TL – More affordable, better reliability, less prestige
5. Cadillac CTS/STS – Domestic alternative, V8 power, lower resale value

Top 10 Recalls, Advisories & TSB Highlights

Recalls:

1. Fuel System/Fuel Tank – Fuel tank flange may leak (2005–2008 models)
2. Airbag Module – Takata airbag inflator recall (multiple years)
3. Fuel Pump Control Module – Fire risk due to corrosion (2005–2008)
4. Power Steering – Hydraulic line may leak (2005–2011)
5. Sunroof – Glass may detach while driving (2006–2012)

Technical Service Bulletins (TSBs):

6. Oil Consumption – TSB for excessive oil use; software updates and consumption testing procedures
7. MMI Software Updates – Multiple updates for system stability and functionality
8. Transmission Reprogramming – CVT and automatic transmission shift quality improvements
9. Climate Control – Blend door motor replacement procedures
10. Xenon Headlight Ballast – Premature ballast failures and replacement guidelines

Maintenance Schedule

Every 10,000 miles or 1 year:

• Oil and filter change (synthetic required)
• Inspect brakes, tires, lights
• Rotate tires

Every 20,000 miles or 2 years:

• Replace cabin air filter
• Inspect air filter (replace if needed)
• Check all fluid levels

Every 40,000 miles or 4 years:

• Replace engine air filter
• Replace spark plugs (some models)
• Inspect suspension components
• Brake fluid flush

Every 60,000 miles:

• Replace transmission fluid (CVT requires more frequent service)
• Inspect/replace drive belts
• Replace spark plugs (if not done at 40k)

Every 80,000–100,000 miles:

• Replace coolant
• Inspect timing chain/tensioners (3.2 V6 – critical)
• Replace fuel filter
• Inspect/replace water pump

As Needed:

• Brake pads/rotors (typically 30,000–50,000 miles)
• Battery (4–6 years)
• Tires (30,000–50,000 miles)
• Wiper blades annually

Note: Multitronic CVT requires fluid changes every 35,000–40,000 miles for longevity.

10 Buyer FAQs

Q1: Which engine is most reliable in the C6 A6? The 3.2 V6 is generally considered most reliable if the timing chain service has been completed. The 2.0T is efficient but has turbo/carbon buildup issues. Avoid the V10 unless you have deep pockets for maintenance.

Q2: Should I avoid the Multitronic CVT transmission? Yes, if possible. The CVT has a poor reliability record. Look for Quattro models with the Tiptronic automatic or rare manual transmission models.

Q3: How much does it cost to maintain an A6 annually? Expect $2,000–$4,000 annually for routine maintenance and repairs if the car is in good condition. Older examples or those with deferred maintenance can exceed $5,000–$8,000/year.

Q4: Is the air suspension worth it? Air suspension provides excellent ride quality but is expensive to repair. Many owners convert to conventional springs when the air system fails to save on long-term costs.

Q5: What mileage is too high for a used C6 A6? With proper maintenance, these can reach 150,000–200,000 miles. However, look for examples under 100,000 miles with complete service records. High-mileage examples (120,000+) should be priced accordingly and have documented major service completion.

Q6: Are parts expensive? Yes. OEM Audi parts are premium-priced. Aftermarket alternatives exist but quality varies. Labor costs at Audi specialists or dealerships are $120–$200/hour.

Q7: Is the 4.2 V8 reliable? The 4.2 V8 is fairly robust but has carbon buildup, ignition coil, and oil consumption issues. It requires premium fuel and gets poor fuel economy (16–18 mpg combined).

Q8: Should I buy an extended warranty? Given the repair costs, an extended warranty from a reputable provider can provide peace of mind, especially for the transmission, air suspension, and electronics.

Q9: What should I look for during a pre-purchase inspection? Check for oil consumption, transmission smoothness, air suspension function, timing chain noise on startup (3.2 V6), service records, MMI operation, and any warning lights. A pre-purchase inspection by an Audi specialist is essential.

Q10: Are these cars expensive to insure? Insurance costs vary by location and driver, but luxury vehicles typically cost more to insure due to higher repair costs and parts prices. Expect above-average premiums.

Final Buyer Recommendations

Should You Buy a 2005–2011 Audi A6?

Buy If:

• You want refined German luxury at a depreciated price point
• You have access to an independent Audi specialist for maintenance
• You can budget $3,000–$5,000 annually for maintenance and repairs
• You find a well-maintained example with complete service records
• You’re buying a Quattro model with the 3.2 V6 and 6-speed Tiptronic (best combination)
• The timing chain service has been completed (3.2 V6 models)

Avoid If:

• You need Toyota/Lexus-level reliability
• You can’t afford unexpected $2,000–$5,000 repair bills
• The car has a Multitronic CVT transmission
• Service records are incomplete or missing
• You’re on a tight budget with no emergency fund
• You plan to use it as a high-mileage commuter without substantial savings

Best Model Year & Configuration:

2009–2011 A6 3.2 Quattro with Tiptronic – These later models have improved electronics, refined drivetrains, and if well-maintained, offer the best balance of performance, luxury, and relative reliability. The 3.2 V6 provides adequate power with better fuel economy than the V8/V10.

Alternatives to Consider:

• Lexus GS/LS – Superior reliability, lower maintenance costs
• Acura TL/RL – Japanese reliability with luxury features
• Infiniti M35/M45 – Good balance of performance and reliability
• 2006+ BMW 5 Series – If you prefer sportier dynamics (similar maintenance costs)

Bottom Line

The Audi C6 A6 is a compelling used luxury sedan offering exceptional comfort, technology, and prestige at depreciated prices. However, it demands a financially prepared owner who understands that German luxury comes with premium maintenance costs. With proper care and a healthy repair budget, these cars can provide years of refined driving enjoyment. Buy the best-maintained example you can afford, establish a relationship with a trusted Audi specialist, and budget appropriately for ownership. This is not a car for the budget-conscious or mechanically inexperienced buyer.

Recommended budget: Purchase price + $5,000–$10,000 emergency fund for first-year repairs and deferred maintenance catch-up.