Audi Audi A6 (C7) | History, Reliability & Buying Guide

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Audi A6 (C7): A Comprehensive Buyer's Guide

The Audi A6 is an executive car manufactured by the German automaker Audi since 1994. It's a mainstay in the mid-size luxury sedan segment, consistently competing with the BMW 5 Series and Mercedes-Benz E-Class. The A6 offers a blend of luxury, performance, and technology, making it a popular choice for both business and personal use. This guide focuses specifically on the A6's fourth generation, known as the C7 (Typ 4G).

Generations: Focusing on the C7 (2011-2018)

C7 Generation (2011-2018)

The C7 generation Audi A6 was a significant step forward from its predecessor, boasting a more refined design, improved technology, and enhanced performance. It was available in sedan (saloon) and Avant (estate/wagon) body styles.

Key Changes and Features:

Design: Sharper, more modern exterior styling featuring Audi's signature single-frame grille and LED lighting. The interior was also redesigned with a focus on luxury and ergonomics.

Engines: A range of petrol and diesel engines were offered, including turbocharged four-cylinder, V6, and V8 options. Performance variants like the S6 and RS6 offered significantly more power.

Technology: Advanced driver-assistance systems became increasingly available, including adaptive cruise control, lane departure warning, blind-spot monitoring, and Audi Pre Sense. The MMI infotainment system was also updated, offering improved functionality and connectivity.

Construction: Lightweight construction using aluminum and high-strength steel helped improve fuel efficiency and handling.

Facelifts:

2015 Facelift: The mid-cycle refresh brought subtle updates to the exterior styling, including redesigned headlights, taillights, and bumpers. The interior also received minor updates. Engine choices were also refined for increased efficiency and performance. The infotainment system received an update as well.

Reliability & Common Issues (C7)

While generally reliable, the C7 generation Audi A6 is not without its potential problems. Here's a breakdown of common issues:

Engine Issues:

2.0 TFSI (Petrol):

Excessive Oil Consumption: This is a well-documented issue in early 2.0 TFSI engines. Piston ring design flaws can lead to excessive oil consumption. Look for evidence of frequent oil top-ups or engine modifications addressing this issue. A compression test can help diagnose this problem.

Timing Chain Tensioner Failure: The timing chain tensioner can fail, potentially leading to catastrophic engine damage. Listen for rattling noises on startup, especially from the front of the engine. Preventative replacement is recommended.

3.0 TFSI (Supercharged V6 Petrol):

Carbon Buildup: Direct injection engines are prone to carbon buildup on the intake valves, which can reduce performance and fuel economy. Regular intake valve cleaning is recommended.

Water Pump Failure: The water pump can fail, leading to overheating. Look for coolant leaks or signs of overheating.

TDI (Diesel) Engines:

Diesel Particulate Filter (DPF) Issues: The DPF can become clogged, especially with frequent short trips. Look for warning lights and reduced performance. Forced regeneration may be necessary, or in some cases, replacement.

EGR Valve Problems: The EGR valve can become clogged with carbon deposits, leading to poor performance and emissions issues.

Transmission Issues:

DSG (S Tronic) Transmission: While generally reliable, the DSG transmission can experience issues with the mechatronic unit or clutch packs. Look for jerky shifting or hesitation. Regular servicing is crucial for DSG longevity.

Tiptronic (Automatic) Transmission: Some reports exist of torque converter problems and general wear with higher mileage. Fluid changes at recommended intervals are vital.

Electrical Issues:

MMI System Problems: The MMI system can experience glitches, freezes, or complete failures. Software updates may resolve some issues.

Sensor Failures: Various sensors, such as parking sensors, ABS sensors, and tire pressure sensors, can fail.

Battery Drain: Some C7 A6 models have been reported to suffer from excessive battery drain, especially with aftermarket electronics installed.

Other Common Issues:

Suspension Issues: Air suspension (if equipped) can develop leaks or compressor failures. Listen for hissing noises or uneven ride height. Regular maintenance and inspection are vital for vehicles with air suspension.

Timing Chain Issues: As mentioned earlier with the 2.0, other engines with timing chains can also develop issues with the chain and associated components.

Driving Experience (C7)

The Audi A6 C7 offers a refined and comfortable driving experience. Here's a breakdown of the pros and cons:

Pros:

Comfortable Ride: The A6 provides a smooth and comfortable ride, especially with the optional adaptive suspension.

Refined Interior: The interior is well-designed and built with high-quality materials.

Advanced Technology: The A6 offers a wide range of advanced technology features, enhancing both convenience and safety.

Good Fuel Economy: The four-cylinder and diesel engines offer good fuel economy for their class.

Powerful Engine Options: The V6 and V8 engines provide impressive performance.

Quattro All-Wheel Drive: Audi's Quattro all-wheel-drive system provides excellent traction and handling in all weather conditions.

Cons:

Potential Reliability Issues: As mentioned above, certain engine and transmission problems can be costly to repair.

Complex Electronics: The advanced electronics can be prone to glitches or failures.

Maintenance Costs: Maintenance costs can be higher than average for a luxury car.

Steering Feel: Some drivers find the steering feel to be somewhat numb, lacking the feedback of some competitors.

Buying Advice (C7)

Here's some advice to help you find the best C7 Audi A6 for your needs:

Years to Look For:

2016-2018 (Post-Facelift): The facelifted models offer updated styling, improved technology, and often have had some of the earlier issues addressed.

Consider Newer Years within the C7 range: Later models within the C7 production run tend to have more refined software and fewer initial production issues.

Years to Potentially Avoid (or Inspect Carefully):

Early 2011-2012 Models: These models are more likely to suffer from the early 2.0 TFSI oil consumption issues. A thorough inspection and service history are essential.

What to Look For:

Complete Service History: A comprehensive service history is crucial to understand the car's maintenance record and identify any potential problems. Pay close attention to transmission fluid changes, timing chain replacements (if applicable), and oil change intervals.

Pre-Purchase Inspection (PPI): Have a qualified mechanic perform a PPI to identify any potential issues before you buy. This is especially important for engines known for specific problems.

Check for Error Codes: Scan the car's computer for any stored error codes. This can reveal underlying issues that may not be immediately apparent.

Test Drive Thoroughly: Test drive the car in various conditions to assess its performance, handling, and comfort. Pay attention to any unusual noises, vibrations, or shifting problems.

Consider Trim Level: The Prestige trim offers a higher level of standard equipment and luxury features.

Engine Choice Considerations: If you're prioritizing fuel economy, the 2.0 TFSI or TDI engines are good choices. If you're looking for more performance, the 3.0 TFSI offers a good balance of power and efficiency. The S6 and RS6 provide even more performance, but at a higher price and with increased running costs.

Air Suspension Check: If equipped with air suspension, test all suspension modes and ensure it raises and lowers correctly. Inspect for any leaks.

Negotiate Based on Findings: Use any identified issues as leverage to negotiate a lower price.

By following this guide and doing your due diligence, you can find a reliable and enjoyable C7 Audi A6 that meets your needs and budget.
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