2020 Audi A4 Mk5 (B9)
Browse our directory of 2020 Audi A4 Mk5 (B9) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.
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Common Problems & Reliability
The 2020 Audi A4 Mk5 (B9) has 4 known issues. 2 of these are classified as serious faults that could be expensive to repair. 2 are moderate concerns worth inspecting before purchase.
AdBlue SCR System NOx Sensor & Tank Heater Failure
SeriousOn 2.0 TDI and 3.0 TDI diesel models, failing downstream NOx sensors or crystallized AdBlue dosing injectors trigger a persistent dashboard no-restart countdown.
Symptoms: "AdBlue: No restart in 650 miles" warning, Engine management light on...
Est. repair cost: £450–£1,200
DL382 S tronic Gear Selection / Mechatronic Faults
SeriousControl 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.
Symptoms: Gearbox warning, Delayed engagement or missing gears
Water Pump / Thermostat Leaks
ModerateLater petrol and diesel engines still suffer coolant leaks from pumps or plastic thermostat housings.
Symptoms: Low coolant warning, Pink residue around front of engine
Est. repair cost: £350–£750
Front Suspension Multi-Link Upper Control Arm Bushing Wear
ModerateThe five-link front suspension utilizes rubber-metal hydro-bushings on the upper control arms that crack and tear, leading to vague high-speed steering and knocking over potholes.
Symptoms: Knocking noise when braking over uneven surfaces, Uneven front tyre inner edge wear...
Est. repair cost: £280–£600
Buying Tips for the 2020 Audi A4 Mk5 (B9)
- Facelift cars with documented water-pump history are the best buys
- Check all LED lighting functions during inspection
- Ensure all software updates have been applied
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