Multitronic CVT Failure
SeriousGearbox & TransmissionThe CVT can judder, flare or lose drive entirely. It is generally less reliable than the Tiptronic or manual alternatives.
Est. Repair Cost: £1,000–£2,500
Reliability GuideCommon Problems with the
Common Problems with the
2004 Audi A4 Mk2 (B6)
By 2004 the B6 was well established and some early Multitronic issues had been addressed. The 1.8T timing belt remains the critical check. This is the safest used B6 buy if maintenance has been consistent.
What changed for 2004
- •Updated trim and equipment levels
- •Minor engine calibration updates
- •Improved build quality over early cars
- •Last year of B6 production
Common MOT watch-outs
- !Timing belt failure on neglected 1.8T cars
- !Multitronic CVT issues still possible
- !Door wiring loom fatigue at higher mileage
- !Age-related coil pack wear
5
Known Issues
3
Serious
2
Moderate
0
Minor
All Known Issues
1.8T Timing Belt / Water Pump Failure
SeriousEngineThe 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.
Est. Repair Cost: £400–£800
Oil Sludge Buildup
SeriousEngineThe 1.8T engine is prone to oil sludge if servicing has been neglected, blocking the oil pickup and starving the engine of lubrication.
Est. Repair Cost: £400–£1,500
Door Wiring Loom Fracture
ModerateElectrics & ElectronicsWires in the door rubber boot fatigue and break over time, causing central locking, window and mirror failures on the driver or passenger side.
Est. Repair Cost: £100–£400
Ignition Coil Pack Misfire
ModerateEngineCoil packs deteriorate with age causing misfires and rough running, a common issue across VW Group petrol engines.
Est. Repair Cost: £40–£150
Buying Tips for 2004 Audi A4 Mk2 (B6)
- ✓Prioritise cars with documented timing belt history
- ✓Check all door electronics for intermittent faults
- ✓Budget for coil pack replacement on higher-mileage petrols