Audi SQ8

Audi recall 10G9: cracks can form on the surface of cylinder bores, leading to engine damage, stalling or oil leaks. Audi replaces affected engines free of charge.

Symptoms: Sudden stall, oil leakage, engine warning light, in worst case engine failure during driving

High-performance 4.0 TFSI turbochargers need a constant oil supply. Insufficient lubrication or degraded oil leads to overheating and turbocharger damage, especially after high-load driving.

Symptoms: Whistling, power loss, blue smoke, increased oil consumption through turbo seals

The 48V BSG of the mild hybrid system fails prematurely on some vehicles, producing a flood of warning lights. Steering and brake boost can be impaired.

Symptoms: Multiple simultaneous warnings (electrical, drivetrain), system crash, occasionally no engine start possible

Direct petrol injection without valve wetting allows blowby gases and EGR deposits to bake onto intake valves. On the 4.0 TFSI, this is accelerated especially by high boost pressures.

Symptoms: Power loss under load, poor throttle response, occasional cold-start stumbling, increased consumption

Start-stop system shuts off the engine before the vehicle has come to a complete standstill. Delayed restart can impair brake booster assistance.

Symptoms: Engine shuts off during roll-out phase, brake pedal briefly hard/stiff, delayed engine restart when pulling away

On the SQ7/SQ8 DCU, PCV and oil separator are subject to the same wear as on RS derivatives. In SUV use with frequent short trips, the condensate load on the PCV system increases.

Symptoms: Oil vapour from breather openings, blue exhaust fumes, increased oil consumption, rough running after oil loss

The DCU engine in the SQ7/SQ8 is also affected by the oil strainer issue. Check whether the revised oil strainer (079115175G) is fitted. In SUV use with towing, thermal turbo loading increases.

Symptoms: Turbo whistling, power loss, blue smoke from exhaust, engine oil level drops faster than normal

The SQ7/SQ8 is frequently used with a trailer, which places heavy thermal loads on the ZF8HP gearbox. Insufficient ATF maintenance accelerates torque converter wear; oil change every 50,000 km recommended when towing.

Symptoms: Gearbox jerk under heavy trailer load, shift hesitation when accelerating with trailer, gearbox overheating warning on long uphill sections

Faulty sensors in both front doors can affect side airbags, head airbags and belt tensioners. RAPEX notification INFO/00089/21, April 2021. Free repair at authorised dealer.

High-voltage battery cell modules can overheat when charging and cause a vehicle fire. KBA action 93QQ affects Q8 PHEV (60 TFSI e) from production period 08/2019–07/2024. Software update as fix, approx. 60 minutes workshop visit.

Oil can leak from the automatic gearbox cooling lines. Gearbox oil on the road increases accident risk. NHTSA campaign 20V272000, 531 vehicles affected.

On Q8 models from 2019–2021 (action 42L1) an incorrectly torqued rear axle nut can alter wheel alignment and affect driving stability. Free repair at dealer.

The Q8 4M air suspension shows typical weaknesses on residual pressure hold valves (approx. 50 € part) and air bags. Warning light illuminates, vehicle drops on one axle, compressor runs continuously to the point of overheating.