How often should the spark plugs of the Tiguan be replaced?

[SanAugust]

Volkswagen Tiguan spark plugs should be replaced every 30,000 kilometers or 4 years. Here is some information about spark plugs: 1. Spark plugs are part of the ignition system. Their main function is to introduce the high voltage from the ignition coil into the engine cylinder, generating a spark between the spark plug electrodes to ignite the air-fuel mixture, thereby enabling the engine to perform work. 2. To determine if spark plugs need replacement, they can be removed for inspection. Check their color, the gap between the electrodes, and whether there is any leakage between the ceramic and metal shell. 3. If removing them is inconvenient, you can also observe if the car has difficulty starting when cold, if the idle is rough, or if there is a noticeable decline in engine performance. If these symptoms occur, the spark plugs need to be replaced.