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Audi
,
A6
,
C5
, 2.5 TDI
(1997-)
Common Issues
Overview
Reviews
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Common Issues
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Faulty Diesel Particulate Filter (DPF)
EGR valve problems
Oil leaks due to worn piston rings or cylinder head gasket
Low compression on one or more cylinders
Faulty Mass Air Flow (MAF) sensor
Ignition coil failure
Fuel filter clogging
Coolant leakages from the water pump, radiator hoses or engine block
Timing belt tensioner failure
Crankshaft position sensor issues
Throttle body problems
Faulty oxygen sensor (O2S)
Worn or loose serpentine belt
Engine oil consumption due to worn piston rings or cylinder head gasket
Turbocharger failure
Faulty electronic throttle control (ETC) module
Air leakage into the crankcase
Spark plug wire and boot issues
PCV system clogging
Water pump failure
Alternator belt failure
Ignition timing problems
Fuel pump failure
Throttle valve sticking or jamming
Electronic engine control unit (ECU) software glitches
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