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2001–2005 Audi A4 Mk2 (B6)

Browse our directory of 2001–2005 Audi A4 Mk2 (B6) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.

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Common Problems & Reliability

3
Serious
2
Moderate
0
Minor

The 2001–2005 Audi A4 Mk2 (B6) has 5 known issues. 3 of these are classified as serious faults that could be expensive to repair. 2 are moderate concerns worth inspecting before purchase.

Multitronic CVT Failure

Serious

The CVT can judder, flare or lose drive entirely. It is generally less reliable than the Tiptronic or manual alternatives.

Symptoms: Rev flare on acceleration, Judder pulling away...

Est. repair cost: £1,000–£2,500

1.8T Timing Belt / Water Pump Failure

Serious

The 1.8T engine uses a timing belt that can fail if intervals are not maintained, destroying the engine. The plastic water pump impeller can also strip.

Symptoms: Overheating in traffic, Heater blowing cold...

Est. repair cost: £400–£800

Oil Sludge Buildup

Serious

The 1.8T engine is prone to oil sludge if servicing has been neglected, blocking the oil pickup and starving the engine of lubrication.

Symptoms: Oil pressure warning, Engine knocking...

Est. repair cost: £400–£1,500

Door Wiring Loom Fracture

Moderate

Wires in the door rubber boot fatigue and break over time, causing central locking, window and mirror failures on the driver or passenger side.

Symptoms: Door window stops working, Central locking intermittent...

Est. repair cost: £100–£400

Ignition Coil Pack Misfire

Moderate

Coil packs deteriorate with age causing misfires and rough running, a common issue across VW Group petrol engines.

Symptoms: Misfiring at idle, Engine management light...

Est. repair cost: £40–£150

View detailed Audi A4 Mk2 (B6) fault guide

Buying Tips for the 2001–2005 Audi A4 Mk2 (B6)

  • ✓Avoid Multitronic CVT cars without a perfect service history
  • ✓Check the plenum chamber (under the battery) for water; blocked drains can fry the ECU
  • ✓Test all electric windows and door locks

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