This is the first technique for resetting your check engine light without a scanner. The newer the car, the more strain it will put on the battery. 1. Now that you have made up your mind to reset your ECU system, just follow these instructions and be safe:. 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. Most vehicles from 1996 and newer have a keep alive memory built-in to the computer system. It’s because of the sophisticated computer system that maintains the overall performance of the vehicle. The best time to change the car’s battery is after two to three years of use. If you want to ensure your car runs smooth, take care of your car’s battery. it chimes again. Now stop, open your car’s bonnet and remove the lead of earth from the battery. Disconnecting the battery alone will not reset the check engine light. I disconnected the battery for a couple of minutes … 2. No opening doors or anything for those 30 min, so leaving the trunk open for 30 min is a must. 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. This 45-minute procedure requires safety gloves, electrical tape, a bucket, baking soda, water, a sponge, a towel and the vehicle key. www.carnewscafe.com/2014/09/resetting-cars-computer-without-tools The battery disconnection technique is a conventional way of resetting your car’s check engine light in some cars. https://carfromjapan.com/article/car-maintenance/how-to-reset-car-computer 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. If you decide to disconnect the battery I have an important tip for you. Get in car, close door, insert key and turn to the "run" position, but do not start engine. 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. Finally tried disconnecting the battery after leaving the trunk open and car unlocked for 30 min to avoid alarm problems. Remove key. Before replacing any parts you want to reset your ECM to ensure that part replacements are absolutely necessary. From outside the car, close all doors, insert key in driver's door, turn to right to roll down all the windows. Drive your car for around 15 minutes to bring it to its normal operating temperature. There are a few ways to reset your Engine control modules. First of all, remove the negative car battery terminal. In some car models, this works, and in others, it will still store the codes. 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