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14 May 2014
I think many people may know obd2 code readers can be used on obd2 (also stand for on-board diagnostic version 2) systems equipped in all cars which manufactured after 1996. Some GM models started obd2 system in 1995. Obd2 standardizes the location and plugs application of the car's computerized system, which simplified the equipment required and the diagnosis time. The first generation obd2 scanners were very expensive and more complex to use because they required different data chips for deferent car models. The pocket OBD code readers today require no data chips and are much more affordable for the home mechanic.

You'll Need obd2 code reader, Operating manual for code reader and Car owner's manual for this job.

Firstly, Open the driver's-side door and look for the trapezoidal diagnostic link connector (also short for DLC) generally under the dash. Since the implementation of obd2, it is mandated that all connectors must be located within two feet of the steering wheel. Most are located under the driver's-side dash board on either side of the steering wheel column. But, this is not the case for some cars. Base on the owner's manual of the car if necessary to find out the DLC.

Secondly, Remove the DLC cover if there is one. Some cars don't have DLC covers. The covers also simply take off. Plug the code reader's plug into the DLC connector. This connector is easily identified, since it is similar in shape to the code reader's plug. The car's battery will provide power to the code reader. The code reader will turn on automatic when it obtains the power.

Thirdly, turn the ignition key to the "on" position without powering the engine on. This will provide power to all electrical components and illuminate the dash board lights. Watch the menu of the code reader and use the key or arrow to move to the "read codes" button or "DTCs" (diagnostic trouble codes) item. Since code readers are made by a lot of manufacturers and feature slightly different items, you will need to read the user manual of the code reader to fully know all of its functions.

Fourthly, Press the "enter" key, if applicable, once the "read codes" or "DTCs" item has been chose. Look up the code reader user manual to identify which DTC caused the malfunction indicator lamp (short for MIL, also known as the check engine light or service engine light) comes on.

Finally, erase the code, if applicable and required (some inexpensive models only can simply read codes), by scrolling to the "erase code" selection or similar option and pressing enter. Some code readers may feature an "erase" button which just simply needs to be pressed on the OBD code reader's panel. Wait until the "command set" message appears on the onscreen menu of the obd2 code reader. If you have any query, please do not hesitate to contact me.


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