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BMW Z4 Most Common Problems (All Years)

21
convertible top motor / hydraulic pump
16
control arm bushing / compliance bushing / tension strut bushing / thrust arm bushing
16
starter
15
valve cover gasket
14
radiator hose / engine coolant pipe
13
ignition coil pack
12
bulb: headlight
12
coolant reservoir / expansion tank
8
thermostat
7
control arm / tension strut / thrust arm / lateral link
7
end link or bushing for stabilizer bar
7
water pump
6
alternator
6
coil spring
6
engine intake hose / tube / boot
6
module / computer for ABS / traction control / stability control
5
exterior trim / body side molding / roof molding
5
oil filter housing gasket / oil filter stand gasket
5
oil filter housing, stand, or adapter
5
oxygen sensor
 
3   6   9   12   15   18   21   24   27   30  
Chart is based on 352 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.