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2017 Audi A4 Mk5 (B9)

Browse our directory of 2017 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

2
Serious
2
Moderate
0
Minor

The 2017 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

Serious

On 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

Serious

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.

Symptoms: Gearbox warning, Delayed engagement or missing gears

Water Pump / Thermostat Leaks

Moderate

Later 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

Moderate

The 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

View detailed Audi A4 Mk5 (B9) fault guide

Buying Tips for the 2017 Audi A4 Mk5 (B9)

  • Check virtual cockpit, MMI and reversing camera thoroughly
  • TDI buyers should watch for NOx-sensor and AdBlue faults
  • S tronic cars should feel clean and decisive

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