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Audi A4 / S4 Most Common Problems

110
wheel bearing / hub
88
thermostat
82
ignition coil pack
76
control arm / tension strut / thrust arm / lateral link
76
water pump
69
motor mount
63
valve cover gasket
50
fuel pump
50
PCV valve
41
piston rings or rotor seals, engine rebuilt
40
bulb: headlight
38
engine coolant flange / inlet or outlet
36
CV boot
34
CV joint / axle / half shaft
33
coolant temperature sensor
32
exhaust flex pipe / mid pipe / tail pipe
32
tie-rod / tie-rod end
31
brake caliper
31
carbon buildup on engine intake or engine valves
31
oxygen sensor
 
11   22   33   44   55   66   77   88   99   110  
Chart is based on 2587 vehicles in TrueDelta's reliability survey.
These are the problems owners most commonly reported on TrueDelta's Car Reliability Survey. For many models not all entries have been coded yet, so focus on the relative numbers rather than the absolute numbers. Usually when people say "they all have this problem," the problem in question actually affects between 10 percent and 20 percent of all cars. We aren't counting wear items like brake pads and rotors that truly do require periodic replacement on all cars.

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