IsItAGoodCar

Common Problems with the
2015–2020 Audi Q7 Mk2 (4M)

We've identified 5 known issues that can affect the 2015–2020 Audi Q7 Mk2 (4M). 2 of these are serious faults that could be expensive to repair.

5
Known Issues
2
Serious
2
Moderate
1
Minor

The 2015–2020 period has 2 more issues than the Audi Q7 Mk2 (4M) average across all year periods.

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.

Most affected: Air-suspension-equipped Q7s

Estimated cost: £700–£2,000Affects: 2015–2024Often appears around: 50k-110k miles

Typical symptoms

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

What to inspect before you buy

  • ✓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

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.

Most affected: 50 TDI, 55 TFSI

Estimated cost: £0 (recall) – £1,500Affects: 2015–2020Often appears around: 20k-60k miles

Typical symptoms

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

What to inspect before you buy

  • ✓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

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.

Most affected: 3.0 TDI, 4.0 TDI, SQ7 TDI

Estimated cost: £250–£1,500Affects: 2015–2024Often appears around: 40k-100k miles

Typical symptoms

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

What to inspect before you buy

  • ✓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

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.

Most affected: All 4M Q7 models

Estimated cost: £0–£1,200Affects: 2015–2024Often appears around: Usually age or software related rather than mileage-specific

Typical symptoms

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

What to inspect before you buy

  • ✓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

Software and Infotainment Bugs

MinorElectrics & Electronics

The complex MMI and vehicle management software can cause spontaneous reboots, camera dropouts, and various phantom warning lights.

Most affected: All 4M Q7 models

Estimated cost: £0–£500Affects: 2015–2024Often appears around: Age-related

Typical symptoms

  • •Spontaneous MMI reboot
  • •Reversing camera unavailable
  • •Phantom dashboard warnings

What to inspect before you buy

  • ✓Use all infotainment features for an extended period
  • ✓Check software update history
  • ✓Verify no persistent fault codes

Buying Tips for the 2015 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
2021–2024 Audi Q7 Mk2 (4M)

Browse 2015–2020 Audi Q7 Mk2 (4M) in our Directory

View MOT history, registration data, and reliability scores for 2015–2020 Audi Q7 Mk2 (4M) vehicles.

View 2015–2020 Directory

Other Audi Q7 Mk2 (4M) Year Periods

2015–20202021–2024

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