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The ignition thing is a mystery, does it with both keys completely randomly... I know because the spare was unused... Done everything apart from rip the steering column out, it's maddening...
I will change the battery but the other key has a new battery in it and that's doing the same thing... 🤯
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That’s odd and similar to a current issue I have. Spare key does not open all the doors. Battery replaced - no change. My mechanic says it cannot happen - the key either works or it doesn’t. I sent him a video and he still says that! The car will be going to him for a service in a while. It’s an Audi A6 and old. Strange
Usually that's a worn key and a close-to-death key fob battery. Replace both?