In these types of dreams you are usually in or near a car or some other type of vehicle which is out of control or has other problems that seem insurmountable. For example, the brakes may have failed, you may have lost control of the steering, or be heading over a cliff or crashing. You can either be the driver or the passenger. This is a very common type of nightmare and it occurs in all people – not just those who can drive. This dream usually means that you are feeling powerless over something in your life – or that you are heading for a crash (metaphorically speaking).
不管會不會開車，都會做與車禍有關的噩夢。這個夢表示你遇到了無力解決的障礙，或者即將迎來“大災”。

In the faulty machinery dream you are trying to operate mechanical equipment which either fails to work, or fails to work in the way that you expect it to. The vast majority of these dreams involve a telephone – either trouble dialing, losing a connection, or dialing a wrong number. It can involve a lost Internet connection, or something manual like a jammed or broken machine. This dream often means that you feel you are losing touch with reality, or that a part of your body or mind is not functioning as it should. It can also occur when you are feeling anxious about making a connection with another person in real life.
夢見手表、手機什么的東西失靈，表示你感覺自己有些與現實脫軌，或者身體哪里不舒服，或者是急于與某人聯系。

來源:可可英語 http://www.ccdyzl.cn/read/201102/126021.shtml