everyone else is talking about the starter solenoid clicking but if you're talking about the same problem i had, its not the starter solenoid..the clicking sound comes from under the dash, just below and to the left of the radio, not under the hood. it was an intermittent problem that i thought i fixed several times. it would only seem to occur if i was running late for work or something.. then i put a starter button in and no problems after that.