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UK Buyer Reliability Guide3 Known Faults Documented

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.

Check a Audi A5 Mk2 (F5) by RegistrationView Audi A5 Mk2 (F5) Specs & MOT History
5
Generation Periods
3
Known Issues
0
Critical Faults
2
Moderate Issues

Select a Model Year Period

Detailed fault breakdown, symptoms, and estimated repair bills by production year.

2022–20242 issues20213 issues2018–20203 issues20173 issues20163 issues

Most Common Audi A5 Mk2 (F5) Faults & Repair Costs

Moderate Risk

Water Pump / Thermostat Housing Leak

Est. Cost£350–£750

Like the B9 A4, the A5 uses plastic cooling components that can seep or fail, causing repeated low-coolant warnings without an obvious puddle.

Warning Signs:

Low coolant warning, Pink residue at the front of the engine, Sweet smell after shutdown

Moderate Risk

NOx Sensor / AdBlue Faults

Est. Cost£250–£1,200

Diesel SCR hardware can trigger AdBlue countdowns, engine-management lights, and expensive sensor or injector replacement once the car is out of warranty.

Warning Signs:

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

Low Risk

MMI / Virtual Cockpit Glitches

Est. Cost£0–£800

Screen freezes, camera dropouts, and Bluetooth instability are common enough on early cars to be worth a deliberate test during inspection.

Warning Signs:

Rebooting or blank centre screen, Camera unavailable message, Phone pairing or audio dropping out

Essential Pre-Purchase Step

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.

Check Any UK Registration FreeExplore Audi A5 Mk2 (F5) Specs & Trims

Inspection Checklist for Audi A5 Mk2 (F5) Buyers

✓Inspect the water pump and thermostat housing for crusty pink residue, as slow coolant leaks are very common on both the 2.0 TFSI and 2.0 TDI engines.
✓Test the S tronic gearbox for smooth engagement; hesitations or clunky shifts could indicate a failing mechatronic unit, especially if the 38k-mile fluid changes were missed.
✓Check the MMI infotainment screen and Virtual Cockpit for flickering, lagging, or black screens, which may require expensive software updates or unit replacements.
✓On diesel models, check for AdBlue system warnings, as failed NOx sensors or injector pumps can lead to a 'no-start' countdown and costly repairs.
✓Examine the front suspension for knocking noises over speed bumps, which is typically caused by premature wear of the complex multi-link control arm bushes.
✓Ensure the matrix LED headlights (if fitted) are fully functional without moisture ingress, as replacing a faulty cluster is exceptionally expensive.