Passive prechamber spark plug

A passive prechamber spark plug for use in a combustion chamber of a vehicle engine, comprising:

• an upper prechamber having an upper opening, wherein the upper prechamber is connectable to the combustion chamber via the upper opening;
• an upper air spark gap, wherein an air ignition spark is formable via the upper air spark gap;
• a central electrode disposed in an upper region of the upper prechamber, wherein a base of the upper prechamber opposite the upper region is an insulator;
• an electrically conductive element or a slot, wherein the electrically conductive element or the slot is guided by the insulator continuously from the upper prechamber into a lower region under the base and wherein the lower region is either a lower prechamber or is arrangeable directly in the combustion chamber;
• and
• an earth electrode disposed in the lower region such that a lower air spark gap is formed between the earth electrode and the electrically conductive element or the slot;
• wherein:
• the lower region is the lower prechamber;
• the lower prechamber has a lower opening wherein the lower prechamber is connectable to the combustion chamber via the lower opening;
• and
• the electrically conductive element or the slot, and the earth electrode, are disposed such that the upper air spark gap and the lower air spark gap are disposed in series relative to each other.