www.carnewscafe.com/2014/09/resetting-cars-computer-without-tools If you want to ensure your car runs smooth, take care of your car’s battery. From outside the car, close all doors, insert key in driver's door, turn to right to roll down all the windows. In some car models, this works, and in others, it will still store the codes. To reset a car's computer, disconnect the battery, clip the battery cables together, clean all of the battery terminals and connectors, reconnect the battery cables, and start the vehicle. One way is by disconnecting the battery cable for 2 to 3 minutes and waiting to see if the check engine light comes back on upon reconnecting the battery and start the car. The best time to change the car’s battery is after two to three years of use. Remove key. 1. Disconnecting the battery alone will not reset the check engine light. The newer the car, the more strain it will put on the battery. 2. Hold accelerator to floor for at least 5 seconds, release pedal and turn off ignition switch. The only thing that I had to re-set (on my 05 OB) was to go through the 20 clicks routine to disconnect the seat belt chime again because, after battery is disconnected, it self defaults the seat belt chime to the OEM factory settings, when battery is re-connected; i.e. I disconnected the battery for a couple of minutes … This 45-minute procedure requires safety gloves, electrical tape, a bucket, baking soda, water, a sponge, a towel and the vehicle key. If you decide to disconnect the battery I have an important tip for you. Drive your car for around 15 minutes to bring it to its normal operating temperature. The computer will be able to hold the memory and the code for several minutes and in some cases several hours. Most vehicles from 1996 and newer have a keep alive memory built-in to the computer system. No opening doors or anything for those 30 min, so leaving the trunk open for 30 min is a must. Now stop, open your car’s bonnet and remove the lead of earth from the battery. There are a few ways to reset your Engine control modules. Disconnecting the battery isnt an actual reset for the computer, its more like telling the computer to temporarily turn the check engine light off, it will always come back on with the same errors, at least if its a mechamical issue. Now that you have made up your mind to reset your ECU system, just follow these instructions and be safe:. it chimes again. Get in car, close door, insert key and turn to the "run" position, but do not start engine. First of all, remove the negative car battery terminal. 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