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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
Unfortunately, this will take a new key fob to allow unlocking and starting to correct this fault here.Your vehicles computers need to see the key fob signals to allow starting.Since you replaced the batteries in the fob and the issue is still occurring the fob needs replaced to resolve this fault.
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That could be the case here.But even though the keys were already checked once before it is possible they have both started to act up now so this is also a possibility.You would have to have this tested further to be sure of the cause then repaired from there.