I recently changed out the knock sensor in my 2000 RX 300. Once everything was back together the car started and ran for about 10 minutes, then it just shut off.... Now it wont start at all. I have several indicators lit, including the security system. What went wrong???:

 

When you put your key in the ignition,does the security light stop flashing? if it does then the security system should be functioning properly.Does it start if you put your foot on the gas a little?