Spark plug is one of the necessary components in vehicles equipped with spark-ignition engines. The spark plug is the one that determines to a decisive degree the optimum performance of your 1999 Volkswagen Passat engine. This typically applies to modern engine management systems in which the Bosch spark plug and its special design is extremely important. The key function of the spark plug is to channel high voltage produced by the ignition coil into the combustion chamber and to combust the fuel/air mixture through the electrical spark between the electrodes. Because of continued use, spark plug wires will cause the development of cracks in the core. This situation will definitely result to misfiring, fouled spark plugs, and rough running of your Volkswagen Passat. A new set of F1000-51773 Bosch spark plug will ultimately bring back the ignition performance of your vehicle. Bosch spark plugs are engineered for total reliability. They guarantee complete firing to ensure right away ignition and excellent fuel consumption. This is for the reason why Bosch spark plugs are mostly preferred by car owners. With this product, not only superior product is obtained but also customer satisfaction and world-class quality. Our site stock spark plugs that are perfect for your 1999 Volkswagen Passat. But it is important that when replacing spark plugs, you have to check the other ignition system components as well. Trust our site to deliver you high quality products such as Bosch spark plugs. It is our main objective to answer all your car troubles and help you get back in the road with your vehicle back in its original shape.