Buying a Used Audi SQ7 (2nd Gen, 2017–2024): Complete Reliability Guide and What to Watch Out For
The Audi SQ7 takes everything great about the Q7 and adds serious performance. With a twin-turbo 4.0-liter V8 producing up to 500 horsepower, the SQ7 transforms into a true family performance SUV — capable of 0–60 mph in around 4 seconds while still offering 7-seat practicality and top-tier luxury.
But as with any high-performance European vehicle, long-term reliability depends heavily on proper servicing. This guide explains common problems, engine durability, and the versions to avoid so you can buy the right SQ7 with confidence.
How Reliable Is the Audi SQ7?
The SQ7 (4M) is generally more reliable than many rivals (GLS 63, X5 M50i, Range Rover V8), thanks to:
✔ A robust V8 with strong internals
✔ Bulletproof ZF 8-speed transmission
✔ Proven quattro AWD system
However, air suspension, electrical features, and V8 cooling components can turn costly if neglected. Good maintenance history is essential when buying used.
Common Problems on the Audi SQ7 (4M)
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Water pump and thermostat leaks — the most common repair
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Turbo oil feed line leaks — if ignored, can damage turbos
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Carbon buildup — typical direct-injection concern
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Air suspension leaks — sagging wheels or harsh ride
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High-pressure fuel pump wear — causes misfires under load
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MMI infotainment glitches — screen freezing or reboots
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Parking sensors or ADAS calibration issues after minor impacts
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Heavy brake and tire wear due to vehicle weight and performance
Most issues are preventable with proactive inspections.
Engine Reliability: 4.0T V8 Twin-Turbo (EA825)
The 4.0T V8 in the SQ7 is shared with the RS6/RS7 and Bentley models — meaning it’s built for extreme power. Unlike smaller Audi engines, it has fewer long-term design flaws.
Strengths:
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High torque with smooth delivery
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Strong internal design (forged parts)
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Proven reliability when maintained properly
Watch for:
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Oil leaks around turbo seals or valve covers
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Coolant leaks in the “hot-V” area
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Carbon buildup every 60–80k miles
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Worn spark plugs causing high-load misfires
Maintenance essentials:
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Oil changes every 5k miles to protect turbos
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Warm up before full boost, cool down after spirited driving
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Top-quality fuel only (91/93 octane)
Verdict:
One of the best and most durable high-performance V8s on the market.
Transmission & Drivetrain: Strong and Stable
The ZF 8HP 8-speed automatic is extremely durable if serviced properly.
Known points:
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Fluid/filter every 50–60k miles is a must
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Harsh shifts usually mean overdue service, not failure
The quattro AWD system is very reliable — just keep differential fluids fresh every 60k miles.
Verdict:
A very robust drivetrain capable of handling the SQ7’s torque with ease.
Other Components to Inspect Carefully
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Air suspension — check ride height and compressor health
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Virtual cockpit — dead pixels or flickering screens can become expensive
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360° cameras — module failures are costly
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Door harness wiring — may cause intermittent window/lock issues
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Sunroof drains — check for damp carpets
Given the vehicle’s complexity, having a full diagnostic scan before purchase is strongly recommended.
Maintenance Tips for Long-Term Reliability
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Oil change every 5,000 miles
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Trans/diff fluid every 50–60k miles
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Inspect turbo oil & coolant lines annually
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Carbon cleaning every ~70k miles
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Replace spark plugs every 30–40k miles
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Avoid short trips that don’t heat the oil fully
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Keep all software updated (MMI + driver assist)
With proper maintenance, the SQ7 can easily surpass 150,000+ miles.
Which SQ7 Models to Avoid
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2017–2018 examples with unresolved coolant and PCV issues
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Heavily tuned vehicles without proof of turbo/cooling upgrades
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Cars with air suspension warnings
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Fleet or auction vehicles with questionable history
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Units showing electrical faults across multiple modules
A fully documented service history is the biggest predictor of reliability.
Upgrade and Customize Your Audi SQ7
Give your SQ7 an even more aggressive and refined look with our premium Audi styling upgrades. Choose from RS-style honeycomb grilles, carbon-fiber mirror caps, front splitters, rear diffusers, and black Audi emblems to personalize your SUV.
Inside, enhance your technology and aesthetics with CarPlay retrofit modules, paddle shifter extensions, and carbon interior trims.
Every product includes free shipping and a 1-year warranty, ensuring both style and peace of mind.
Verdict: Is the Audi SQ7 a Good Used Buy?
✔ Very reliable engine and drivetrain
✔ Outstanding performance for a family SUV
✔ Luxurious and refined — daily usable power
⚠ Repairs can be expensive — you’re maintaining supercar-grade parts
If you want the power and prestige of a performance flagship with room for the whole family, a well-maintained SQ7 is one of the best performance SUV buys today