Audi A5 Mk2 (F5) Common Problems & Reliability
The second-generation Audi A5 (F5) is a much better used bet than its predecessor, feeling virtually identical to the A4 B9 underneath but wrapped in a far more stylish coupe, convertible, or Sportback body. It sits comfortably in the premium executive segment, offering slightly higher running costs than an A4 but delivering excellent motorway refinement and strong residual values. UK ownership is usually characterized by minor cooling-system leaks, diesel AdBlue hardware issues, and occasional MMI software gremlins rather than catastrophic engine failures. It suits image-conscious professionals and high-mileage commuters looking for an elegant, comfortable, and tech-laden grand tourer.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common Audi A5 Mk2 (F5) Faults & Repair Costs
Water Pump / Thermostat Housing Leak
Like the B9 A4, the A5 uses plastic cooling components that can seep or fail, causing repeated low-coolant warnings without an obvious puddle.
Low coolant warning, Pink residue at the front of the engine, Sweet smell after shutdown
- Inspect coolant level from cold and look around the pump and housing for staining
- Check whether the car needs repeated top-ups
- Look for specialist or dealer invoices rather than generic coolant additions
NOx Sensor / AdBlue Faults
Diesel SCR hardware can trigger AdBlue countdowns, engine-management lights, and expensive sensor or injector replacement once the car is out of warranty.
AdBlue warning or no-start countdown, Engine light with emissions faults, Repeated warnings soon after topping up AdBlue
- Scan the car for stored NOx and SCR faults
- Ask for evidence of recent sensor, injector, or software work
- Avoid diesel cars used only for short commutes if the emissions history is patchy
MMI / Virtual Cockpit Glitches
Screen freezes, camera dropouts, and Bluetooth instability are common enough on early cars to be worth a deliberate test during inspection.
Rebooting or blank centre screen, Camera unavailable message, Phone pairing or audio dropping out
- Use navigation, media, phone, and camera functions together
- Check software update history
- Verify that the car remembers paired devices and does not reboot during the drive
DL382 S tronic Gear Selection / Mechatronic Faults
Control or clutch faults can interrupt gear selection. Identify the gearbox code first: this entry applies to the longitudinal DL382 family, not every automatic sold under the same model name.
Gearbox warning, Delayed engagement or missing gears
- Test drive from cold and again when warm
- Check gearbox-specific service invoices and obtain a diagnostic report
Buying a used Audi A5 Mk2 (F5)? Always check for hidden finance and write-off history.
Mechanical problems are only half the battle. Over 1 in 3 UK used cars checked have unpaid finance or accident write-off records that could cause you to lose the car or thousands in value.