How to: Auto Diagnostic Testing 1Borrow an OBD-II scanner from your local auto parts store. Most national auto parts companies, such as Murray's and O'Reilly's automotive diagnostic tool, will lend OBD-II scanners. You'll need to leave collateral like a driver's license or credit card while you take the scanner out to work on your car in the parking lot.2Plug the OBD-II scanner into your car's Data Link Connector (DLC).
The DLC is usually located below the driver's-side dash, just left of center auto diagnostic software. It has 16 connection points and should match the cord included with the OBD-II scanner. If you cannot find it, refer to your car owner's manual or contact the manufacturer. Your car must be on, but don't start the engine.3Turn on the scanner and follow the on-screen instructions.
The scanner may generate generic codes and manufacturer's specific codes. Generic codes are the same for every automobile. Consult the online guide for generic OBD codes to determine the problem. The OBD-ll scanner can't read manufacturer's codes .If your car is showing a manufacturer code, take it to your local dealership shop to determine the specific problem.4Consult with your mechanic once you've retrieved your car's trouble codes. She can discuss the various repairs needed for your car's problem.
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