汽车故障码是指车载电脑诊断系统检测到故障后生成的一个代号，用来提示车主和修理工具体的故障信息。通常采用OBD-II故障码格式，由5个字符组成，每个字符表示不同的含义。
OBD-II故障码通常由6位数字组成，前两位数字表示制造商代码，后四位数字表示故障代码。制造商代码由SAE国际标准规定，后四位数字则根据不同的故障类型而不同。
常见的汽车故障码包括P0系列、P1系列、P2系列、P3系列等。其中P0系列表示发动机方面的故障，P1系列表示变速器方面的故障，P2系列表示转换汽油方面的故障，P3系列表示其他方面的故障。
读取OBD-II故障码需要使用诊断工具，比如汽车电脑诊断仪。首先插入诊断接头，启动汽车，然后使用诊断工具读取故障码。诊断工具会将故障码翻译成可读的文本，此时需要根据文本来判断故障的类型和性质，然后进行相应的修复。
如果已经修复了故障，必须清除汽车故障码。清除故障码需要使用诊断工具，进入诊断工具的“清除故障码”选项，清除对应故障码即可。注意，一些故障码可以自动清除，但是有些故障码需要手动清除。
读取和清除汽车故障码需要谨慎操作，不要随便清除，要根据故障码的类型和性质来处理。此外，如果遇到无法解决的问题，最好找专业的修理工进行处理，以免加重故障。
If you own a modern vehicle, you may have come across the term OBD-II codes. These codes, also known as trouble codes or diagnostic trouble codes (DTCs), are generated by the on-board diagnostic (OBD) system in your car when it detects a problem. The codes are made up of six digits, which are usually displayed on a scanner or reader tool.
The first two digits of the code refer to the system or subsystem that is experiencing an issue. This could be anything from the engine to the transmission to the airbags. The third digit tells you if the problem is related to emissions or not. Digits four, five, and six provide specific information on the type of problem, such as a sensor malfunction or a misfire in the engine.
Some of the most common OBD-II codes include P0300, which indicates a random misfire in the engine, and P0171, which means the fuel system is running too lean. Other common codes include P0420, which indicates a catalytic converter problem, and P0442, which means there is a small EVAP leak in the emissions system.
If you get an OBD-II code, it's important to take action as soon as possible. Ignoring the code could lead to more serious problems down the line, and it could even cause your vehicle to fail an emissions test. The first step is to look up the code online or consult your vehicle's manual to see what it means. If you're not comfortable working on your car, it's best to take it to a qualified mechanic.
OBD-II codes may seem intimidating at first, but they are a useful tool for diagnosing issues with your vehicle. Understanding the structure of the codes and knowing what to do if you get one can help you keep your car running smoothly and avoid costly repairs down the line.
