Passat car has been put into operation in 1999, and has been in Shanghai Volkswagen offline for nearly 9 years. In 2005, the Shanghai Volkswagen launched a new model, PASSAT, based on the B5 of the Passat, which is called the B5.5 in the industry because it is fully oriented to China's market and road conditions. At present, Shanghai Volkswagen has sold over 1 million Passat and PASSAT leaders, enjoying a high reputation in the domestic senior car market. The author has been engaged in PASSAT maintenance for many years, and summarized the common failures and troubleshooting methods.