Modern vehicles are complex machines, relying heavily on electronic systems to control everything from the engine to safety features. When something goes wrong, your car’s onboard computer often generates error codes. This is where a car scanner, also known as an OBD scanner, becomes an invaluable tool. But what exactly does a car scanner do? Let’s dive into the world of automotive diagnostics and explore the capabilities of these handy devices.
Understanding the Basics of a Car Scanner
A car scanner is essentially a diagnostic tool that communicates with your vehicle’s computer system, often referred to as the Engine Control Unit (ECU) or Powertrain Control Module (PCM). The term OBD stands for On-Board Diagnostics, and the port used to connect the scanner is a standardized 16-pin socket, known as OBD2 in most regions and EOBD in Europe. This port has been a standard feature in petrol cars since 2001 and diesel cars since 2004.
Car scanners come in various forms, from simple handheld devices to more advanced computer-based systems. Regardless of their complexity, their core function remains the same: to access and interpret the data stored within your car’s computer.
Key Functions of a Car Scanner
At its most basic level, a car scanner performs three crucial functions:
- Communicates with the Vehicle: The scanner plugs into the OBD port, establishing a communication link with the car’s computer. This connection allows the scanner to request and receive data about the vehicle’s systems.
- Reads Fault Codes: When a problem occurs, the car’s computer logs diagnostic trouble codes (DTCs). These codes are essentially error messages that pinpoint potential issues within the vehicle. A car scanner reads these fault codes, displaying them as alphanumeric codes (e.g., P0171). These codes provide a starting point for diagnosing problems, indicating the system or component that is experiencing a malfunction.
- Clears Fault Codes: Once a repair has been made, a car scanner can be used to clear the stored fault codes from the vehicle’s computer. Clearing the codes also turns off the check engine light or other warning lights on the dashboard, assuming the underlying issue has been resolved.
It’s important to note that while most basic car scanners can read and clear fault codes, they generally do not offer advanced functionalities like resetting service lights for oil changes, ABS, or SRS systems. For these more complex tasks, specialized tools or software, like Haynes AutoFix, are often required to guide you through the process.
Why Use a Car Scanner?
Investing in a car scanner can be a smart decision for any car owner, especially those who prefer to handle basic car maintenance themselves. Here’s why a car scanner is a valuable tool:
- Faster Problem Diagnosis: When your car displays a warning light, a scanner provides immediate insight into the potential problem by revealing the fault codes. This eliminates guesswork and speeds up the diagnostic process.
- Cost Savings: Instead of immediately taking your car to a mechanic for a diagnostic check, which can cost around £50 on average, you can use your own scanner to identify the issue first. This saves you money and allows you to decide whether you can fix the problem yourself or need professional help.
- DIY Car Repair: Combined with resources like online repair manuals and guides, a car scanner empowers you to diagnose and potentially repair common car problems at home. This is particularly beneficial for simple issues that can be resolved with basic tools and knowledge.
Conclusion
In conclusion, a car scanner is a vital tool for understanding your car’s health. It acts as a translator, deciphering the error codes generated by your vehicle’s computer and providing valuable information about potential problems. Whether you are a seasoned DIY mechanic or simply a car owner wanting to be informed, a car scanner is a worthwhile investment that can save you time, money, and stress when dealing with car issues. By understanding “what a car scanner does,” you can take a more proactive approach to car maintenance and repair.
