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A comment on Something mysterious is blocking car key fobs from working in an Alberta town. Parent comment

Re:Something mysterious is blocking car key fobs from workin... by matt4077 on Thursday January 31, 2019 @02:21PM (#19047833)
I once had to be towed because the key stopped working. This was a Smart Roadster (still the greatest car I ever had, nonewithstanding). A battery change didn’t work and the mechanics sent me 100km to get the spare key.

So there are definitely circumstances where the phi’s always artifact alone just isn’t enough to start the car, only to get in.

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Re:Something mysterious is blocking car key fobs from workin... by peeters on Thursday January 31, 2019 @03:08PM (#19048289)
Don't know how universal it is, but my keyless car has separate failsafe for entry and start. To get into the car, you can slide the physical key out. To start the car, you use the fob to push the start button which I understand to use a passive circuit similar to credit card tap.
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