Audi A7
EA839 turbo V6 with 250 kW and 48V mild hybrid. Successor to the supercharged V6, now with exhaust turbocharger. Very refined and powerful engine.
Fastback elegance reimagined
In the A7 4K the DLZA meets the most modern body in the range. Mild hybrid ensures seamless power delivery, and the sport chassis makes the A7 feel more agile than the saloon. The ideal everyday sports car for adults.
Engine Weaknesses 7
The EA839 DLZA (A6 C8, A7 4K, A8 D5) shares the known water pump weakness. Vacuum-controlled pump failure allows coolant to migrate into the vacuum system. Critical: 4-bolt pump still original, 6-bolt = already replaced.
Symptoms: Coolant warning light, coolant loss, P0299, 'drivetrain fault', start-stop disabled.
Early EA839 variants with poor-quality rocker arm rollers (GP0) are also possible in the DLZA. Rollers can fall out and cause camshaft and piston damage.
Symptoms: Combustion misfire, knocking from cylinder head, engine fault light, rough running.
The DLZA is fitted with a 48V MHEV. The belt starter-generator (BSG) and the 48V lithium-ion battery can fail. Control units before 2021 without moisture protection are vulnerable.
Symptoms: '48V system fault', rough starting, no recuperation, start-stop disabled, limp mode.
EA839 DLZA as a direct-injection engine without intake valve washing: oil mist from crankcase ventilation settles as coke on the valves. On long-distance A6/A7/A8 use often noticeable from 80,000 km.
Symptoms: Hesitation, cold-start weakness, power loss at part throttle.
Beyond water pump failure, EA839 engines in the business class (A6, A7, A8) also show coolant losses from seal failure. Regular coolant level checks important.
Symptoms: Coolant smell, dropping coolant level, overheating warning.
EA839 DLZA under high load shows elevated oil consumption from piston ring wear. With long service intervals in the A6/A7/A8 the problem can go unnoticed for some time.
Symptoms: Oil consumption above 0.5 L/1,000 km, bluish exhaust, oil smell.
In the extensively networked A6 C8 / A7 4K / A8 D5, occasional engine management sensor failures (boost pressure sensor, lambda) lead to the engine warning light without consequential damage.
Symptoms: Engine warning light, various fault codes, occasional power reduction.
Vehicle Weaknesses 5
A7 4K models 2020–2021: nuts on rear axle control arms do not meet specification. If they fracture, the rear axle can break away uncontrollably.
53,449 vehicles A6/A7/Q5 produced 2019–2024: cell modules in the 48V battery can overheat during charging and cause a fire risk.
On the optional adaptive suspension, servo actuators inside the dampers can fail due to moisture ingress. The damper must be replaced as a complete unit.
The complex MMI system crashes or displays spurious warnings. Incorrect lighting system errors and driver assistance faults are known.
The elaborate electrical system with numerous driver assistance systems puts heavy demands on the 12V battery. Early failure especially on short-run use.
Reports & Tests
44 owner complaints filed with NHTSA (2018–2024). Most reported: Electrical (26), Engine (9), Powertrain (8).