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THIS WORKS!!!!!! It will work for all cars. Disconnect the both cables from the battery terminals. Hold the two cables together--in contact--for 10-15 seconds. MAKE SURE you do not touch the battery terminals with the cables while you are touching them to each other. [The first part of the next sentence makes no sense whatsoever.]This will drain the remaining battery in the cables themselves and it clears the computer. Simply reconnect and wah-lah. fixed. [I think the writer means that holding the two battery-cables in contact will drain the remaining "juice" in the cables, but that does not seem to me to be a correct description of what results from holding the two cables in contact with each other for 10-15 seconds.]

[touching the cables together will short the cars entire electrical circuit, clearing any charge held in the computer systems. Some cars may require the key to be in the accessory position. DO NOT DO CROSS THE CABLES IF THE CAR IS RUNNING. Also, do not do this if your car has a second battery (this is found on some security systems and some European cars). Cars with such systems usually have a jumper that, when shorted, will reset the computer. If you are unsure if you car has such a system, please check your manual or take the car to a mechanic. NOTE: some cars may require a code to be entered into the stereo unit after disconnecting the battery. This is true on SAABs and BMWs, among others.]

AnswerCheck out the O2 sensors.might be bad, or not connected [off topic - this is a common problem but please answer the question]
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Q: How do you reset the check engine light on 2001 Hyundai?
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