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What is the reason for the car key malfunction after replacing the battery?

2 Answers

VonNolan

07/24/25 6:35am

The reason for the car key malfunction after replacing the battery is coding failure. The solution is: insert the car key into the keyhole and twist it repeatedly, being careful not to start the car. After repeating this four or five times, press and hold any button on the car key to recode and reactivate it. The functions of the key are: 1. Automatically close the windows after turning off the engine; 2. Convenient for finding the car in a parking lot; 3. Automatically open the trunk; 4. Remotely open the windows. The method for replacing the key battery is: 1. Take out the car key; 2. Insert a flat-head screwdriver into the gap on the side of the key to open the key cover; 3. Remove the battery and replace it.

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HaleyRose

08/11/25 2:21am

I just replaced the battery and now the key fob isn't working. I've encountered this situation several times. The most common reason is usually that the battery was installed backwards - simply reversing the positive and negative terminals can solve the problem; I made this mistake at first, and of course the key wouldn't respond with the new battery in the wrong orientation. Secondly, the new battery itself might be problematic - some cheap ones have insufficient charge or poor quality, so try switching to a reliable brand. If you're too rough when changing the battery, you might damage the internal contacts or circuit board springs, causing poor connection; cleaning the metal parts can help. Additionally, some car models require reprogramming or resynchronization after battery replacement, such as holding down a specific button for a few seconds to restore the signal - check the manual for details. I recommend taking a photo to remember the original battery position before replacement, and testing immediately after completion just in case.

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