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1999–2004 Audi A6 Mk2 (C5)

Browse our directory of 1999–2004 Audi A6 Mk2 (C5) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.

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Common Problems & Reliability

1
Serious
4
Moderate
0
Minor

The 1999–2004 Audi A6 Mk2 (C5) has 5 known issues. 1 of these are classified as serious faults that could be expensive to repair. 4 are moderate concerns worth inspecting before purchase.

Blocked Plenum Drains

Serious

Leaves and debris block the drains, leading to water entering the cabin and damaging the CCM.

Symptoms: Wet front carpets, Electrical behaving strangely

Est. repair cost: £100–£800

Front Multi-Link Suspension Wear

Moderate

The C5 uses a sophisticated aluminium multi-link front suspension with eight control arms per side. Bushings harden and ball joints develop play, causing clunks and vague steering.

Symptoms: Clunking over bumps, Imprecise steering...

Est. repair cost: £350–£900

Instrument Cluster Pixel Failure

Moderate

The dot-matrix LCD in the instrument cluster loses pixels column by column, making the trip computer, odometer and warnings unreadable.

Symptoms: Partial or blank display, Hard to read fuel level or temperature...

Est. repair cost: £100–£400

ABS Module Failure

Moderate

The Bosch 5.3/5.7 ABS control unit develops internal solder faults, triggering ABS and brake warning lights and sometimes causing speedometer dropouts.

Symptoms: ABS and brake warning lights, Speedometer dropping to zero...

Est. repair cost: £200–£500

Driver Door Wiring Loom Breakage

Moderate

Wires in the rubber boot between the body and driver door fatigue and snap over time, causing central locking, window and mirror failures.

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

Est. repair cost: £100–£300

View detailed Audi A6 Mk2 (C5) fault guide

Buying Tips for the 1999–2004 Audi A6 Mk2 (C5)

  • ✓Check the front carpets for dampness (blocked plenum drains)
  • ✓The multi-link front suspension is complex and expensive to refresh
  • ✓1.8T models need proof of regular oil changes

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