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
2008–2013. The fault list covers this generation and the engines in it. If the listing gives the exact version, pick it below.

Vauxford / CC BY-SA 4.0
What to watch for
The list covers the generation, the engines and the transmissions. Once you pick the version, only the faults that apply to it stay.
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
The balance shaft module drives the oil pump through a hexagonal shaft stub.
Applies to the engine CAGA, CAHA, CJCA.
This is the engine that made the VW-Audi oil sludge affair famous.
Applies to the engine CFMA.
The continuously variable gearbox of the longitudinal engine Audis (Multitronic) is vulnerable from both the control unit and the drive chain side.
Applies to the transmission 01J.
The air conditioning system fails more and more often as the mileage rises: first it does not cool enough, later it blows lukewarm air, and finally it drops out completely.
It can affect every car in this generation.
The internal springs of the flywheel tire, and the two discs knock against each other.
Applies to the engine CAGA, CAGC, CAHA and 3 more.
The combined housing of the water pump and the thermostat is plastic, and it is bolted directly to the hot engine block.
Applies to the engine BWE, CDHA, CDHB and 1 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 BWE, CDHA, CDHB and 1 more.
5 more faults belong to this generation. On the version page, only the ones that apply stay.
The manufacturer fixes these for free at a franchised dealer. Ask with the VIN whether it was done. The list covers the whole generation. We did not filter it by model year. Some apply only to a narrower production window.
Most recent: 10 February 2020
A12/00337/20Safety recallInjuries10 February 2020 · EU Safety GateIn the event of an accident with airbag activation, the front passenger airbag gas generator housing may explode. Fragments from the gas generator can cause injuries.
Remedy: Type of economic operator taking notified measure(s): Importer Category of measure(s): Recall of the product from end users Date of entry into force: 10/02/2020
SR/00564/25Safety recallInjuriesno date · EU Safety GateThe propellant in the inflator of the driver airbag may deteriorate over time. If the airbags deploy, it could result in fragments of the inflator injuring the vehicle's occupants. The product does not comply with the Regulation on the approval and market surveillance of motor vehicles and their trailers, and of systems, components and separate technical units intended for such vehicles.
Remedy: Type of economic operator taking notified measure(s): Importer Category of measure(s): Recall of the product from end users Date of entry into force: Unknown
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.
I · 2008–2013
The fault list opens on the version page.
105 versions
1.6 l · 1595 cm³
ALZ · ML450
1.6 BusinessLine
2009–2012 · BusinessLine
1.6 l · 1595 cm³
ALZ · ML450
1.6 BusinessLine
2009–2012 · BusinessLine
1.6 l · 1595 cm³
ALZ · ML450
1.6 BusinessLine High
2009–2012 · BusinessLine High
1.6 l · 1595 cm³
ALZ · ML450
1.6 BusinessLine High
2009–2012 · BusinessLine High
1.6 l · 1595 cm³
ALZ · ML450
1.6 Reference
2009–2012 · Reference
1.6 l · 1595 cm³
ALZ · ML450
1.6 Reference
2009–2012 · Reference
1.6 l · 1595 cm³
ALZ · ML450
1.6 Style
2009–2012 · Style
1.6 l · 1595 cm³
ALZ · ML450
1.6 Style
2009–2012 · Style
1.8 l · 1781 cm³
CDHA · ML450
1.8 TSI 120hp BusinessLine
2009–2012 · BusinessLine
1.8 l · 1781 cm³
CDHA · ML450
1.8 TSI 120hp BusinessLine
2009–2012 · BusinessLine
1.8 l · 1781 cm³
CDHA
1.8 TSI 120hp Businessline High
2012–2013 · Businessline High
1.8 l · 1781 cm³
CDHA
1.8 TSI 120hp Businessline High
2012–2013 · Businessline High
1.8 l · 1781 cm³
CDHA · ML450
1.8 TSI 120hp BusinessLine High
2009–2012 · BusinessLine High
1.8 l · 1781 cm³
CDHA · ML450
1.8 TSI 120hp BusinessLine High
2009–2012 · BusinessLine High
1.8 l · 1781 cm³
CDHA · ML450
1.8 TSI 120hp Comfort Edition
2009–2012 · Comfort Edition
1.8 l · 1781 cm³
CDHA · ML450
1.8 TSI 120hp Comfort Edition
2009–2012 · Comfort Edition
1.8 l · 1781 cm³
CDHA · ML450
1.8 TSI 120hp Reference
2009–2012 · Reference
1.8 l · 1781 cm³
CDHA · ML450
1.8 TSI 120hp Reference
2009–2012 · Reference
1.8 l · 1781 cm³
CDHA · ML450
1.8 TSI 120hp Style
2009–2012 · Style
1.8 l · 1781 cm³
CDHA · ML450
1.8 TSI 120hp Style
2009–2012 · Style
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 150hp BusinessLine
2009–2012 · BusinessLine
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 150hp BusinessLine
2009–2012 · BusinessLine
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 150hp BusinessLine High
2009–2012 · BusinessLine High
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 150hp BusinessLine High
2009–2012 · BusinessLine High
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 150hp Reference
2009–2012 · Reference
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 150hp Reference
2009–2012 · Reference
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 150hp Sport
2009–2012 · Sport
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 150hp Sport
2009–2012 · Sport
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 150hp Style
2009–2012 · Style
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 150hp Style
2009–2012 · Style
1.8 l · 1781 cm³
CFMA · ML450
1.8 TSI 160hp Reference
2009–2012 · Reference
1.8 l · 1781 cm³
CDHB · ML450
1.8 TSI 160hp BusinessLine
2009–2012 · BusinessLine
1.8 l · 1781 cm³
CDHB · ML450
1.8 TSI 160hp BusinessLine
2009–2012 · BusinessLine
1.8 l · 1781 cm³
CDHB
1.8 TSI 160hp Businessline Executive
2012–2013 · Businessline Executive
1.8 l · 1781 cm³
CDHB
1.8 TSI 160hp Businessline Executive
2012–2013 · Businessline Executive
1.8 l · 1781 cm³
CDHB · ML450
1.8 TSI 160hp BusinessLine High
2009–2012 · BusinessLine High
1.8 l · 1781 cm³
CDHB · ML450
1.8 TSI 160hp BusinessLine High
2009–2012 · BusinessLine High
1.8 l · 1781 cm³
CDHB · ML450
1.8 TSI 160hp Reference
2009–2012 · Reference
1.8 l · 1781 cm³
CDHB · ML450
1.8 TSI 160hp Sport
2009–2012 · Sport
1.8 l · 1781 cm³
CDHB · ML450
1.8 TSI 160hp Sport
2009–2012 · Sport
1.8 l · 1781 cm³
CDHB · ML450
1.8 TSI 160hp Style
2009–2012 · Style
1.8 l · 1781 cm³
CDHB · ML450
1.8 TSI 160hp Style
2009–2012 · Style
2.0 l · 1968 cm³
CAGC · CJCC · ML450
2.0 TDI 120hp BusinessLine
2009–2012 · BusinessLine
2.0 l · 1968 cm³
CAGC · CJCC · ML450
2.0 TDI 120hp BusinessLine
2009–2012 · BusinessLine
2.0 l · 1968 cm³
CAGC · CJCC · ML450
2.0 TDI 120hp BusinessLine High
2009–2012 · BusinessLine High
2.0 l · 1968 cm³
CAGC · CJCC · ML450
2.0 TDI 120hp BusinessLine High
2009–2012 · BusinessLine High
2.0 l · 1968 cm³
CAGC · CJCC · ML450
2.0 TDI 120hp Comfort Edition
2009–2012 · Comfort Edition
2.0 l · 1968 cm³
CJCC · CAGC · ML450
2.0 TDI 120hp Comfort Edition
2009–2012 · Comfort Edition
2.0 l · 1968 cm³
CAGC · CJCC · ML450
2.0 TDI 120hp Reference
2009–2012 · Reference
2.0 l · 1968 cm³
CAGC · CJCC · ML450
2.0 TDI 120hp Reference
2009–2012 · Reference
2.0 l · 1968 cm³
CAGC · CJCC · ML450
2.0 TDI 120hp Style
2009–2012 · Style
2.0 l · 1968 cm³
CAGC · CJCC · ML450
2.0 TDI 120hp Style
2009–2012 · Style
2.0 l · 1968 cm³
CAGA · CJCA · ML450
2.0 TDI 143hp BusinessLine
2009–2012 · BusinessLine
2.0 l · 1968 cm³
CAGA · CJCA
2.0 TDI 143hp BusinessLine
2009–2012 · BusinessLine
2.0 l · 1968 cm³
CAGA · CJCA · ML450
2.0 TDI 143hp BusinessLine
2009–2012 · BusinessLine
2.0 l · 1968 cm³
CAGA · CJCA
2.0 TDI 143hp BusinessLine
2009–2012 · BusinessLine
2.0 l · 1968 cm³
CAGA · CJCA
2.0 TDI 143hp BusinessLine High
2009–2012 · BusinessLine High
2.0 l · 1968 cm³
CAGA · CJCA · ML450
2.0 TDI 143hp BusinessLine High
2009–2012 · BusinessLine High
2.0 l · 1968 cm³
CAGA · CJCA
2.0 TDI 143hp BusinessLine High
2009–2012 · BusinessLine High
2.0 l · 1968 cm³
CAGA · CJCA · ML450
2.0 TDI 143hp BusinessLine High
2009–2012 · BusinessLine High
Neighbouring generations
I (3R). If the listing is from the changeover year, look at the neighbour too.
Previous generation
This is the earliest.
This generation
I · 2008–2013
Next generation
This is the latest.
Common questions
2008–2013. The changeover year can fall in two generations. If the listing is from that year, look at the neighbour too.
No. It depends on the engine and the transmission too.
The fault list is.
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.