How often should the spark plugs be replaced on an A4?

[Davis]

Typically, the spark plugs in an Audi A4 need to be replaced every 40,000 to 60,000 kilometers. How spark plugs work: Under high voltage, the air between the center electrode and the side electrode of the spark plug rapidly ionizes, igniting the air-fuel mixture in the engine's combustion chamber. Steps for replacing spark plugs: Open the hood, lift the plastic engine cover, remove the high-voltage ignition wires, and mark each cylinder's position to avoid confusion. Use a spark plug socket to remove the spark plugs one by one. While removing them, check for any external debris like leaves or dust and ensure everything is cleaned thoroughly. Place the new spark plugs into the spark plug holes, hand-tighten them a few turns, and then use the socket to tighten them further. Reinstall the high-voltage ignition wires in the correct firing order, then reattach the cover.