How To Clean Car Battery Contacts. First check the battery in the key fob. Jump-start the battery.

Find a flat surface to park your car and let the engine cool for about 5 minutes. If you come into direct contact with battery acid flush. If a fault is detected or the car battery is getting too low.
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You will have to re-sync the key with the car. At the very least you should know where it is located in your engine bay. Remove inspect and clean the fuse contacts with sandpaper. If you come into direct contact with battery acid flush.
