IsItAGoodCar
Reliability Guide

Common Problems with the
2017–2019 Audi Q7 Mk2 (4M)

We've identified 4 known issues that can affect the 2017–2019 Audi Q7 Mk2 (4M). 2 of these are serious faults that could be expensive to repair.

4
Known Issues
2
Serious
2
Moderate
0
Minor

All Known Issues

Air Suspension Strut / Compressor Failure

SeriousSuspension & Chassis

The 4M rides beautifully on air, but leaking struts or tired compressors can leave the car sagging and trigger costly chassis warnings.

Est. Repair Cost: £700–£2,000
Warning Signs:

Uneven ride height after parking, Compressor running loudly or for too long, Level-control system warning

What to Inspect:
  • Inspect ride height after the car has stood overnight
  • Cycle the suspension through its height settings
  • Check whether any struts or the compressor have already been replaced
Verified by IsItAGoodCar Research Team

48V Mild Hybrid BSG Failure

SeriousElectrics & Electronics

The belt-starter-generator (BSG) in the 48V mild hybrid system can fail, disabling start-stop and eventually draining both batteries, leaving the car stranded.

Est. Repair Cost: £0 (recall) – £1,500
Warning Signs:

Electrical system malfunction warning, Start-stop inactive, Total loss of electrical power

What to Inspect:
  • Check Audi recall database for 48V BSG campaign
  • Verify no electrical warnings on test drive
  • Check if car has had the updated BSG unit fitted
Verified by IsItAGoodCar Research Team

NOx Sensor / AdBlue System Faults

ModerateExhaust & Emissions

Diesel SCR faults are the most common high-value annoyance on the 4M, often causing AdBlue warnings and eventual no-start countdowns even when the tank has been topped up.

Est. Repair Cost: £250–£1,500
Warning Signs:

AdBlue warning or no-start countdown, Engine light with emissions faults, Warnings returning soon after topping up AdBlue

What to Inspect:
  • Scan for NOx, SCR, and AdBlue injector faults
  • Ask for evidence of sensor, injector, or software replacements
  • Be cautious of cars with a recent reset but no repair invoice
Verified by IsItAGoodCar Research Team

MMI / Electrical Module Glitches

ModerateElectrics & Electronics

Owners commonly report frozen MMI screens, camera faults, battery drain, and keyless-entry glitches - usually software or module related, but expensive if neglected outside warranty.

Est. Repair Cost: £0–£1,200
Warning Signs:

Blank or rebooting MMI screen, Camera unavailable or parking-sensor errors, Flat battery after standing or poor key recognition

What to Inspect:
  • Use navigation, media, cameras, and phone pairing together on a long drive
  • Check software campaign history and whether the car has had unexplained battery replacements
  • Test both keys, tailgate operation, and all lighting functions
Verified by IsItAGoodCar Research Team

Buying Tips for 2017–2019 Audi Q7 Mk2 (4M)

  • ✓Diesel buyers should look hard at AdBlue and NOx-sensor history because repeated no-start countdowns are a known pain point
  • ✓Air-suspension cars must sit level after standing and should not show "level control" warnings after startup
  • ✓Test the MMI, digital dash, cameras, keyless entry, and power tailgate thoroughly because module faults can be expensive to chase
  • ✓If the car has towed regularly, ask for gearbox servicing and listen for driveline shunt at low speed
20162020
Check a 2017–2019 Audi Q7 Mk2 (4M) by Registration