Timing chain tensioner and cam phaser wear
high- Typically appears
- 80–130k mi
- Estimated repair
- $1,200 – $2,800
2007 Audi
A6Sedan
Sedan
The 2007 Audi A6 is a full-size German luxury sedan that sat at the heart of Audi's lineup, competing with the BMW 5 Series and Mercedes-Benz E-Class. Built on the Volkswagen Group's C6 platform, it offered a sophisticated ride, a well-appointed cabin, and available quattro all-wheel drive — though the FWD 3.2L V6 variant was the volume seller in the U.S. At 17 years old now, this car rewards buyers who are prepared for European luxury maintenance costs and punishes those who aren't. The 3.2L V6 (often badged as 3.1L in some EPA documents due to rounding) pairs with a smooth six-speed automatic and delivers a composed, quiet highway experience. Interior quality was genuinely excellent for the era — soft-touch surfaces, MMI infotainment, and available air suspension made it feel upmarket. That same complexity is what drives repair bills today. For a Wisconsin owner, the FWD configuration is the weak link compared to quattro AWD stablemates. It handles snow adequately with good winter tires, but the quattro versions are noticeably more capable in Lake Geneva's winters. Anyone buying this car needs to budget realistically — deferred maintenance on a 2007 A6 compounds quickly.
Reliability
2/5
Verified data
Specs shown for A6 — the most common configuration.
Other trims may vary in engine, drivetrain, or fuel economy. Sign in to see your vehicle's exact specs.
Engine
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Drivetrain
FWD
Fuel
Premium gasoline
MPG
18 city / 27 hwy / 21 combined
Seats
—
Doors
—
Body
Midsize Cars
Overview
AI-curatedThe 2007 Audi A6 is a full-size German luxury sedan that sat at the heart of Audi's lineup, competing with the BMW 5 Series and Mercedes-Benz E-Class. Built on the Volkswagen Group's C6 platform, it offered a sophisticated ride, a well-appointed cabin, and available quattro all-wheel drive — though the FWD 3.2L V6 variant was the volume seller in the U.S. At 17 years old now, this car rewards buyers who are prepared for European luxury maintenance costs and punishes those who aren't. The 3.2L V6 (often badged as 3.1L in some EPA documents due to rounding) pairs with a smooth six-speed automatic and delivers a composed, quiet highway experience. Interior quality was genuinely excellent for the era — soft-touch surfaces, MMI infotainment, and available air suspension made it feel upmarket. That same complexity is what drives repair bills today. For a Wisconsin owner, the FWD configuration is the weak link compared to quattro AWD stablemates. It handles snow adequately with good winter tires, but the quattro versions are noticeably more capable in Lake Geneva's winters. Anyone buying this car needs to budget realistically — deferred maintenance on a 2007 A6 compounds quickly.
Known for
- Refined, quiet highway ride with a premium cabin
- Audi's MMI interface and feature-rich tech for 2007
- Strong 3.2L V6 power delivery and smooth transmission
- Higher-than-average repair complexity and parts cost
- Available Audi Drive Select and adaptive air suspension (S-line trims)
Best for
- Experienced European car owners comfortable with luxury maintenance costs
- Highway commuters who prioritize ride quality over low TCO
- Buyers who want near-luxury feel at a used-market price
- Drivers who keep a trusted independent Audi/VW shop
Watch for
- Deferred timing chain or cam phaser service — can be engine-ending
- Air suspension failure (if equipped) — expensive to repair or convert
- Electrical gremlins in the MMI and comfort electronics modules
- High cost of ownership if maintenance has been skipped by prior owners
- FWD configuration limits winter traction versus quattro models
Common issues by mileage
6 knownIntake/exhaust valve control solenoid (VVT oil control valve) failure
medium- Typically appears
- 70–120k mi
- Estimated repair
- $300 – $700
Oxygen sensor / heater circuit failure
medium- Typically appears
- 80–150k mi
- Estimated repair
- $250 – $550
Air suspension compressor or strut failure (if air suspension equipped)
high- Typically appears
- 80–120k mi
- Estimated repair
- $900 – $2,500
MMI infotainment and comfort module electrical faults / CAN bus communication errors
medium- Typically appears
- 60–130k mi
- Estimated repair
- $300 – $1,200
Coolant leak from plastic coolant flanges and thermostat housing
high- Typically appears
- 60–110k mi
- Estimated repair
- $400 – $900
Maintenance schedule
- 1 Every 5,000–7,500 miles (do not stretch to Audi's older 10k OLM interval on a high-mileage engine) Engine oil change with VW 502.00-spec full synthetic
Clean oil is the single best protection for the timing chain tensioners and cam phasers. Low or dirty oil accelerates phaser wear rapidly on this engine.
- 2 At or before 100k miles if no documented history exists Inspect and replace timing chain tensioners and guides
Timing chain stretch or tensioner failure can cause catastrophic engine damage. On a used example without records, treat this as overdue.
- 3 Every 40,000 miles Replace spark plugs (iridium OEM-spec)
Worn plugs increase misfires and stress ignition coils. Coils are not cheap on this engine; keeping plugs fresh reduces coil load.
- 4 Every 50,000 miles or at first sign of leaks Inspect and flush coolant; check all plastic coolant flanges and the thermostat housing
The plastic coolant components on this platform become brittle with age. A slow leak can cause overheating before the driver notices.
- 5 Every 40,000–50,000 miles Transmission fluid change (Tiptronic)
Audi marks this 'lifetime' fluid, but in practice the ZF-based Tiptronic benefits from fresh fluid to prevent harsh shifts and valve body wear.
- 6 Annually, or any time the car sits noticeably lower on one corner Inspect air suspension struts and compressor (if equipped)
Air strut leaks cause the compressor to overwork and fail. Catching a strut leak early is far cheaper than replacing the compressor too.
- 7 Every 20,000 miles Replace cabin air filter and inspect HVAC blend door actuators
A clogged cabin filter strains the blower motor. Blend door actuators on this platform are a known failure point that affects heat and A/C distribution.
- 8 Brake fluid every 2 years; caliper inspection every 30,000 miles Inspect and lubricate brake caliper slides; replace brake fluid
Wisconsin road salt accelerates caliper slide corrosion, leading to uneven pad wear. Brake fluid absorbs moisture over time and should be flushed on schedule.
Always defer to the manufacturer's service manual for warranty-mandated intervals.
Cost of ownership
Annual maintenance
$1,200 – $2,800
Fuel
Requires premium (91+ octane). At 21 MPG combined and average Wisconsin driving, expect $2,200–$2,800/year in fuel depending on pump prices.
Insurance
Expect mid-to-upper tier rates for a luxury sedan of this age — roughly $1,200–$1,800/year for a typical driver, though your history and coverage level vary this considerably.
The 2007 A6 is inexpensive to buy but carries real ongoing costs. Parts are more expensive than domestic or Japanese alternatives, and many repairs require dealer-level scan tools (VCDS/ODIS) to properly diagnose and reset adaptations. Budget $1,200–$2,800 per year in maintenance and plan for at least one significant repair (timing, suspension, or electrical) in the next 30–40k miles if service history is incomplete.
Seasonal care
Lake Geneva, WI Winter
- Install a dedicated set of winter tires — the FWD configuration makes winter traction heavily dependent on tire quality. All-seasons are not adequate for Lake Geneva winters.
- Check the battery every fall. Cold cranking amps drop sharply below 20°F, and Audi's electronics place a high parasitic load on the battery. Replace any battery over 4 years old proactively.
- Use a winter-grade washer fluid rated to at least -30°F; the A6's large windshield makes adequate washer fluid critical for salt spray visibility.
- Flush and inspect the cooling system before winter — a slow coolant leak that's manageable in summer can strand you when the thermostat cycles hard in sub-zero temps.
- Apply a rust inhibitor or undercoating to exposed underbody areas annually. Wisconsin road salt is hard on the A6's aluminum and steel subframe components.
- Warm up the engine gently for the first mile in extreme cold — the timing chain and cam phasers are oil-pressure dependent, and cold thick oil takes longer to fully circulate.
Summer
- Check tire pressure monthly — pressure drops ~1 PSI per 10°F temperature swing, and summer heat in a dark parking lot can push pressures several PSI above spec.
- Inspect the A/C system for refrigerant leaks and verify the cabin blower and blend doors are functioning. The A6's HVAC system is capable but complex; address weak cooling before peak heat.
- Check coolant level and inspect all hoses after winter — road salt and temperature cycling stress the rubber and plastic cooling components.
- After winter, rinse the undercarriage and wheel wells thoroughly to remove accumulated road salt before it continues to corrode brake lines and suspension components.
Comparable vehicles
2007 BMW
5 Series
Direct segment competitor — similar size, price point, and ownership complexity. The 528i offers comparable luxury with RWD dynamics. Shares the same 'budget for repairs' caveat.
2007 Mercedes-Benz
E-Class
Same luxury sedan segment and used-market price range. Generally slightly more reliable electronically in this era but similarly expensive to service.
2007 Volvo
S80
Full-size luxury sedan at a similar used price, with a better reputation for passive safety and somewhat lower electrical complexity than the A6.
2007 Lexus
GS 350
If long-term reliability is the priority, the GS 350 delivers near-comparable luxury with significantly lower maintenance costs and better dealer/independent support in the upper Midwest.
If you're shopping for one
Red flags
- No service records or vague 'dealer maintained' claims with no documentation — on a 17-year-old luxury car, this is a serious red flag.
- A car sitting notably lower on one corner (failing air strut) or a compressor that runs continuously after startup.
- Any timing-related DTCs (P0012, P0015, P0022, P0025) present — these indicate potential phaser or chain damage that may require major engine work.
- Evidence of coolant in the oil (milky dipstick) or oil in the coolant reservoir — signs of head gasket or worse.
- Seller unwilling to allow a pre-purchase inspection at an independent Audi/VW specialist.
- CAN bus / network communication faults (U-codes) that the seller dismisses as 'minor' — these can indicate deeper wiring or module failures.
What to inspect
- Pull VCDS (VAG-COM) fault codes — not just generic OBD-II. Many A6 faults are manufacturer-specific and won't show on a generic scanner.
- Ask for all service records and specifically look for timing chain/tensioner service, coolant system work, and transmission fluid changes.
- Check the air suspension (if equipped) by letting the car sit overnight and verifying it hasn't sagged on any corner by morning.
- Look under the car for any signs of oil leaks around the valve covers and front of the engine — common on higher-mileage 3.2L engines.
- Test all MMI functions, window regulators, sunroof, seat adjusters, and HVAC zones. Electronics repairs are labor-intensive on this platform.
- Inspect the underbody and wheel arches for rust — especially the subframe mounting points and rear wheel arch lips, which trap salt in Wisconsin winters.