Audi Q8 e-tron 55 quattro GE

The Q8 e-tron carries over the same asynchronous motor design from the original e-tron, which has a known weakness: a ceramic/graphite seal separating the motor coolant circuit from the electrical components can fail. When this happens, coolant enters the motor windings and destroys them within minutes. The motor must then be replaced entirely. On the original e-tron, this affected approximately 2% of vehicles, primarily 2019-2021 builds. Audi made refinements to the rear motor on the Q8 e-tron (14 coils vs 12), but the fundamental seal design remains. Forum reports of Q8 e-tron failures exist, though they appear less frequent than on the original. Audi extended the motor warranty to 10 years / 190,000 km in the USA, but this does not apply in Europe where the standard 2-year warranty is all that is offered. Check the small plastic catch reservoir next to each motor: it should be completely empty. Any coolant indicates an active leak.

The Q8 e-tron 55 comes with adaptive air suspension as standard. The compressor can fail, causing the car to sag on all corners with a suspension malfunction warning. Individual air struts can also develop leaks, typically in cold or damp conditions, causing one corner to sit lower after overnight parking. The Q8 e-tron benefits from the revised compressor and updated control unit software introduced in August 2023, but the fundamental system remains the same as on the Q7 and Touareg. Compressor replacement costs approximately €950-1,200, while a single air strut runs €1,200-1,800. Regular driving rather than extended parking helps maintain seal condition. Listen for the compressor cycling frequently or running for extended periods after startup.

A widely reported issue on both the e-tron and Q8 e-tron. Because regenerative braking handles most deceleration, the friction brakes are used infrequently. This causes surface rust to build up on the rotors, and when the brakes are applied forcefully, uneven pad material deposits create brake shudder. Multiple owners report needing brake disc replacements within 20,000-30,000 km despite minimal pad wear. The car's first few brake applications after a cold start intentionally disable regen to scrub the rotors clean, but this does not fully prevent the issue. Using the brakes more aggressively on occasion (such as manually braking on downhill stretches) helps prevent rotor glazing. A full rotor and pad replacement for one axle costs approximately €500-750 at an independent shop.

The 12V battery powers all ancillary systems and can drain within 7-14 days if the car is parked without being plugged in. The HV battery only charges the 12V when the car is in Ready mode or during HV charging. The myAudi app regularly polls the vehicle, accelerating drain. Scheduled charging with a long delay before the session starts can also flatten the 12V during the wait. When the 12V dies, the car becomes completely unresponsive despite a fully charged main battery. The recovery procedure requires a jump start or booster pack. Audi has released software updates to reduce standby drain on later builds, and starting climate control via the app can trigger the relay between HV and 12V batteries. Budget for periodic 12V battery replacement (every 3-4 years) and keep the car plugged in during extended parking.

Owners report intermittent MMI freezing, delayed touchscreen responsiveness, Bluetooth drops, and complete system crashes. The MIB3 platform can display indefinite loading messages. A quick fix is holding the power/volume knob until both screens reset. For persistent issues, a full system reboot (lock car, remove all keys, wait one hour) can help. Audi has released multiple software updates (versions 3900+), but some dealers report that major updates can take a full day and occasionally require control unit replacement (€800-1,500). The Q8 e-tron launched with more mature software than the original e-tron, but glitches persist. Ensuring all available updates are applied before purchase is essential.

Some owners report that the car plugs in and the charger begins the handshake, but times out before energy flows. Level 2 AC charging typically works fine on the same car. The issue appears to be station-specific (older chargers more affected) and can sometimes be resolved by ensuring the CCS plug is fully seated, disabling Plug & Charge, or starting the session with an RFID card rather than the app. A full vehicle power cycle can also resolve intermittent communication faults. In rare cases, the on-board charger control module needs a software update or replacement (up to €800), but most instances are resolved without hardware changes.

The Q8 e-tron's virtual mirrors include a heating element connected to the rear window heater (an improvement over the original e-tron's unheated first-generation cameras). However, condensation issues persist in some units, particularly in persistently cold and humid conditions. Symptoms include foggy images and 'Visibility reduced' warnings. The heating element clears most condensation within 5 minutes of activation, but repeated condensation cycles can damage the camera sensor, requiring replacement at approximately €500-600 per unit. Cars with conventional glass mirrors are unaffected. If the car has virtual mirrors, check camera clarity in person, ideally on a cold morning.