Changed one low beam bulb and now the other three don't come on, but when you turn on the high beams all the lights light up.
You may have a shorted wire going to the headlights. A technician can test all the fuses and check to see if the wiring is shorted to ground and diagnose the problem. I would look at the fuses to the headlight to see if they are blown and then go from there.
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