Audi Workshop Service and Repair Manuals

A - Leaks downstream of air mass meter

• Possible fault sources:

•     1 -    Connection hoses between air mass meter and turbocharger
•     2 -    Connection hose to crankcase vent

• Effect:

•      -    Loss of power

B - Leaks downstream of turbocharger (intake side)

• Possible fault sources:

•     1 -    Air duct hoses and pipes between turbocharger and charge air cooler
•     2 -    Air duct hoses and pipes between intercooler and intake manifold
•     3 -    Intercooler
•     4 -    Seal underneath intake manifold pressure sender -G71/intake manifold temperature sender -G72
•     5 -    Seal between intake connection, mechanical exhaust gas recirculation valve and intake manifold
•     6 -    Seal between intake manifold and cylinder head

• Effect:

•      -    Boost pressure too low

C - Leaks downstream of turbocharger (exhaust side)

• Possible fault sources:

•     1 -    Parts of exhaust gas recirculation
•      2 -    Connection between exhaust manifold and cylinder head

• Effect:

•      -    Boost pressure too low, possibly exhaust smell, traces of soot in engine compartment