How to change remote key fob battery in Volvo S40 V50 V70 C30 C70 - YouTube
Reprogramming key?? The battery died in my key fob, I replaced it, and now it isn't programmed and won't lock/unlock the car. Has this happened to anyone else? : r/Volvo
Bad key fob connection / broken battery clips : r/Volvo
V40 Remote control key/PCC - replacing the battery | Volvo Support UK
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