The EGR cooler cools the recirculated exhaust gas before it enters the intake again, and coolant flows through it while it does so.
Applies to the engine CAHA.
Repair: 600–1,500 EUR
vinkodex.Audi Allroad C6 common faults.
2004–2011. The fault list covers this generation and the engines in it. If the listing gives the exact version, pick it below.
M 93 / CC BY-SA 3.0 de
What to watch for
What can go wrong on this car?
The list covers the generation, the engines and the transmissions. Once you pick the version, only the faults that apply to it stay.
critical3
The balance shaft module drives the oil pump through a hexagonal shaft stub.
Applies to the engine CAHA.
The timing chain of the longitudinal V6 diesel runs at the back of the engine, on the gearbox side, so replacing it means taking out the engine or the gearbox.
Applies to the engine ASB, BPP.
expensive4
The front suspension of the longitudinal engine Audis (and the Seat Exeo derived from them) works with four control arms per side: two above, two below.
It can affect every car in this generation.
Dual mass flywheel: diesel
expensiveThe internal springs of the flywheel tire, and the two discs knock against each other.
Applies to the engine CAHA, CANA, CANC and 2 more.
With direct injection the fuel does not wash the intake valves: the petrol goes into the cylinder, not behind the valve.
Applies to the engine AUK, BVJ, CAJA.
The vanes of the variable geometry turbo are glued together by soot and oil arriving through the EGR.
Applies to the engine CAHA, CANA, CANC and 2 more.
comfort1
The G62 sensor tells the engine control unit how hot the coolant is.
Applies to the engine CAHA, CANA, CANC and 5 more.
Engines and transmissions in this generation
A fault is often tied to the engine, not to the whole generation. You find the engine code in the registration document.
C6 · 2004–2011
Pick the version.
The fault list opens on the version page.
20 versions
EngineVersionPowerFuel · transmissionBody
2.7 l · 2698 cm³
BPP · AL420
2.7 TDI
2006–2008
180 HPdiesel · automaticestate2.7 l · 2698 cm³
BPP · AL420
2.7 TDI Pro Line
2006–2008 · Pro Line
180 HPdiesel · automaticestate2.7 l · 2698 cm³
CANA · CANC · AL420
2.7 TDI
2008–2011
190 HPdiesel · automaticestate2.7 l · 2698 cm³
CANA · CANC · AL420
2.7 TDI Pro Line
2008–2011 · Pro Line
190 HPdiesel · automaticestate3.0 l · 2967 cm³
ASB · AL420
3.0 TDI
2006–2008
233 HPdiesel · automaticestate3.0 l · 2967 cm³
ASB · ML450
3.0 TDI
2006–2008
233 HPdiesel · manualestate3.0 l · 2967 cm³
ASB · AL420
3.0 TDI Pro Line
2006–2008 · Pro Line
233 HPdiesel · automaticestate3.0 l · 2967 cm³
ASB · ML450
3.0 TDI Pro Line
2006–2008 · Pro Line
233 HPdiesel · manualestate3.0 l · 2967 cm³
CDYA · CDYC · AL420
3.0 TDI
2008–2011
240 HPdiesel · automaticestate3.0 l · 2967 cm³
CDYA · CDYC
3.0 TDI
2008–2011
240 HPdiesel · manualestate3.0 l · 2967 cm³
CDYA · CDYC · AL420
3.0 TDI Pro Line
2008–2011 · Pro Line
240 HPdiesel · automaticestate3.0 l · 2967 cm³
CDYA · CDYC
3.0 TDI Pro Line
2008–2011 · Pro Line
240 HPdiesel · manualestate3.0 l · 2995 cm³
CAJA · AL600
3.0 TFSI
2008–2011
290 HPpetrol · automaticestate3.0 l · 2995 cm³
CAJA · AL420
3.0 TFSI Pro Line
2008–2011 · Pro Line
290 HPpetrol · automaticestate3.1 l · 3123 cm³
AUK · ML310
3.2 FSI
2006–2008
255 HPpetrol · manualestate3.1 l · 3123 cm³
AUK · AL420
3.2 FSI
2006–2008
255 HPpetrol · automaticestate3.1 l · 3123 cm³
AUK · AL600
3.2 FSI Pro Line
2006–2008 · Pro Line
255 HPpetrol · automaticestate3.1 l · 3123 cm³
AUK · ML310
3.2 FSI Pro Line
2006–2008 · Pro Line
255 HPpetrol · manualestate4.2 l · 4163 cm³
BVJ · AL420
4.2 FSI
2006–2008
350 HPpetrol · automaticestate4.2 l · 4163 cm³
BVJ · AL420
4.2 FSI Pro Line
2006–2008 · Pro Line
350 HPpetrol · automaticestate
Neighbouring generations
C6 · 2004–2011
C6 (2004-2011). If the listing is from the changeover year, look at the neighbour too.
Common questions
About this generation
Which years does this page cover?
2004–2011. The changeover year can fall in two generations. If the listing is from that year, look at the neighbour too.
Does the fault apply to every car like this?
No. It depends on the engine and the transmission too.
Is it free?
The fault list is.
Information, not an expert opinion
We write the descriptions, and we put the source next to them. A person reviews them before they go out. They are still information, not a technical expert opinion.
- A fault on the list does not mean the car you are looking at has it.
- A fault missing from the list does not mean the model is fault-free. Write-ups are made model by model. Not all of them are done.
- You decide whether to buy. This is no substitute for an inspection. That needs a workshop and a history check.