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An OBD-II scanners saves time when troubleshooting problems with a vehicle's engine. The vehicle's computer runs a series of routine tests and checks on the engine. Once a problem crops up, the computer issues a code and classifies the problem as "pending." If that occurs more times, the status changes to "trouble code" and the service engine light will come on. You do not have to have an active service engine light to use an on-board diagnostics system. A good scanner not only retrieves trouble codes, but identifies pending ones too.

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Some scanners power up by themselves and automatically retrieve codes, while others must be manually switched on with a "retrieve" command entered. Some only display codes, while others can interact with a computer through a USB cable. Also, while acquainting yourself with a scanner and its manual, bookmark the lists of Auto code reader definitions. You will need to reference them.
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Find the diagnostic data link connection in your vehicle. For most vehicles, this is found beneath the dashboard and between the gas pedal and left panel. In some vehicles, this outlet is exposed, while others are not. You are looking for a 16-pin receptor port usually molded out of black plastic.

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Hook your scanner up to the diagnostic data connection. Slight variations in performing tests will start here because of differences in X-431 Diagun. The following are general steps to complete a test.
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Turn on your vehicle. Some scanners will require only power, but others might need the engine cranked. If you are using a scanner that does not feature an "auto-on," switch it on and key in a "retrieve" command. It will take a second for codes to appear on the scanner.
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Scroll through the codes and differentiate between what is "trouble" and what is "pending." Always attend to trouble codes first. Consult the scanner's manual for coding definitions. Many scanners' manuals, however, only have generic codes that apply to all OBD-II vehicles. Manufacturers have supplemental codes particular to their vehicles. If you cannot find the code description in a manual, you might need to search for the definitions online.
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Turn off the scanner and vehicle. Open the hood and look into the engine compartment to examine areas that need further scrutiny. However, if the scanner reported something unfamiliar, take the vehicle to a mechanic.