Why does my car just click when I try to start it?

Rapid clicking when you turn the key = the starter solenoid is engaging but there isn't enough current to spin the motor. 90% of the time that's a dead or weak battery. Try a jump start: if it fires right up, your battery is the problem (and may be at end of life, especially if it's 4+ years old). One single loud clunk instead of rapid clicking points at a failing starter motor itself.

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