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Porsche 911 Most Common Problems

22
window regulator mechanism
19
water pump
15
control arm / tension strut / thrust arm / lateral link
12
ignition coil pack
10
air oil separator (AOS)
9
coolant reservoir / expansion tank
8
ignition switch / key cylinder
7
clutch lining / friction plate wore out
7
motor mount
7
radiator hose / engine coolant pipe
7
TPMS (tire pressure monitor) sensor
6
alternator
6
catalytic converter
6
clutch accumulator
6
end link or bushing for stabilizer bar
6
spoiler
6
strut (suspension)
5
cable for battery, alternator, or starter
5
clutch release bearing / throw-out bearing
5
CV boot
 
3   6   9   12   15   18   21   24   27   30  
Chart is based on 427 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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