An automotive diagnostic scanner, also known as a car diagnostic computer
, can easily plug into an automobile's computer system in order to read the codes installed for each car's on-board computer. However, not every car diagnostic computer is the same. Check the model that you have purchased -- or are considering purchasing -- is compatible with your vehicle. Car diagnostic computers are useful to have in your toolbox since a lower-end model can cost less than $100, which is comparable cost-wise to having your car scanned at a service center.
1. Open the driver's side door of your car. Since 1996, vehicles produced for the American market have utilized a standardized On-Board Diagnostics (OBD) system. This means that every car manufactured since 1996 is readable by most diagnostic analyzers used by professional mechanics as well as those available to consumers. The D-style, plug-in connector for a diagnostic analyzer is usually located underneath the driver's console in or around the fuse box. Refer to the owner's manual for your vehicle to help locate the plug-in connector for the obd2 scanner.
2. Turn on the diagnostic car scanner and plug it into the D-style plug-in connector. Follow the prompts on the scanner and press the "Check" button. Different scanners will operate with slight variations. Turn the key in the ignition to the "Accessories" position. Wait two to five minutes for the scanner to read the code(s) displayed by the car. Some lower-end scanners may require you to connect the scanner to a computer via a USB port. According to CarsDirect.com, a Palm Pilot will often work to help read the code from the scanner.
3. Look up the diagnostic trouble code on the Internet if your code reader does not have the ability to display the problem. Some bmw multi tool that are more expensive will be able to tell you what the problem is as well as the code that goes along with the problem.
4. Clear the code from your car after making the necessary repair. If the codes or a "Check Engine Light" reappears after driving the vehicle a few miles, the problem has not been resolved and will need to be looked at again.