2021 Audi Q4 e-tron
Browse our directory of 2021 Audi Q4 e-tron vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.
Registration Directory
Common Problems & Reliability
The 2021 Audi Q4 e-tron has 4 known issues. 1 of these are classified as serious faults that could be expensive to repair. 2 are moderate concerns worth inspecting before purchase.
12V Auxiliary Battery Drain from Telematics Control Unit
SeriousThe 12V auxiliary battery can suffer parasitic drain when parked if the Emergency Call (eCall) or online telematics gateway fails to enter sleep mode, immobilising the vehicle.
Symptoms: Vehicle completely dead after standing 48+ hours, "Electrical system: fault! Safely stop vehicle" warning...
Est. repair cost: £150–£400
MMI Infotainment Screen Freezes and App Connectivity Drops
ModerateEarly cars should be checked for software-related connectivity and charging-function issues. Audi offered software 3.2 for vehicles built through model year 2022, adding improved charging and online functions; verify the applicable update with the dealer.
Symptoms: MMI screen black on startup, Audio volume stuck or silent...
Rear Drum Brake Sticking and Actuator Corrosion
ModerateThe Q4 e-tron uses sealed rear drum brakes to minimize rolling resistance and particle emissions. Due to heavy regenerative braking, internal electromechanical handbrake actuators can stick after parking in wet weather.
Symptoms: Loud clunk or binding when pulling away after rain, Electronic parking brake warning light...
Est. repair cost: £200–£450
Heat Pump Expansion Valve Clicking & Efficiency Degradation
MinorOn models optioned with the heat pump, internal expansion valves can stick or click loudly in winter temperatures, reducing cabin heating performance and range efficiency.
Symptoms: Clicking or buzzing noise from behind dashboard in cold weather, Cabin slow to warm up in winter...
Est. repair cost: £0–£600
Buying Tips for the 2021 Audi Q4 e-tron
- Ask for the charging curve to be demonstrated on a fast charger, not just a home wallbox
- Cars built after mid-2024 received the larger-capacity cell update - worth hunting for
- Check the frunk and boot linings for dealer demo wear on off-lease examples
Check Any Vehicle
Don't see your specific car listed? Enter any UK registration number for an instant vehicle history check — including MOT history, tax status, finance check, and write-off data.
Free Vehicle Check