In-depth Reviews

BMW Z4 roadster - Reliability & safety

Five-star safety rating but BMW Z4 owner satisfaction remains to be proven

Carbuyer Rating

3.9 out of 5

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Reliability & safety Rating

4.0 out of 5

BMW is one of the respected German 'Big Three' premium brands. All three have a desirable, high-quality reputation, yet neither BMW or its Audi or Mercedes rivals are exactly top-ranking where it comes to owner satisfaction. The Z4 scored the full five stars when it was tested by Euro NCAP, thanks in part to a healthy list of crash-avoidance technology available as standard or at extra cost.

BMW Z4 reliability

BMW is currently 27th out of 30 manufacturers in our annual Driver Power owner satisfaction survey – behind Audi in 21st and just ahead of Mercedes in 28th.

It's difficult to tell whether BMW's alliance with Toyota for the Z4's development will have any effect on its reliability – the Japanese brand is well thought-of for the dependability of its cars, and only 9.6% of drivers reported a fault in the first year of ownership, compared to 20.4% for BMW.


The BMW Z4 achieved a five-star safety rating from Euro NCAP, including an impressive 97% score in the adult occupant category.

The Z4 has all the safety equipment you'd expect of a new car these days, from mandatory kit such as anti-lock brakes (ABS), stability control and tyre pressure monitoring, through to today's must-haves such as autonomous emergency braking. However, it's on the options list that you'll find the most impressive technology, with driver-assist systems like adaptive cruise control, lane keeping assist and reversing assistance only available at extra cost.

The same is true of the clever adaptive LED headlamps, whose main beam will adjust in shape to avoid dazzling oncoming traffic at speeds of 44mph and above.

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