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I have a 2006 Honda Accord. The key fob broke off and I tried starting my car without it, but the engine does not turn over. It works fine with my spare key.

The obvious explanation is that I'm not applying enough torque, because there's only a little stub of a key sticking out. But I really am cranking it all the way, so it seems hard to believe. Is there any other reason my key wouldn't turn over the engine without the fob?

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    Does the old fob have a chip in it. You may want call a Honda dealer and ask if the fob has a chip that in needed to start the car.
    – Alaska Man
    Commented Aug 28, 2020 at 16:47
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    @AlaskaMan can you expand that comment into an answer, as I'd say that's exactly what's wrong, a passive chip in the fob disarming the immobilizer.
    – Nick C ♦
    Commented Aug 28, 2020 at 16:53
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    Yes, @AlaskaMan is correct. There is a wedge shaped ceramic transponder chip also built inside the case of the key not just the keyless entry controls. You should call a reputable locksmith to get a new key and programming done. Your car will not crank, fire or provide fuel without out a properly coded transponder. The car is immobilized. This is stock on all accords since about 1998.
    – narkeleptk
    Commented Aug 29, 2020 at 1:37

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There's a Chip inside the key fob that needs to be at a certain distance from your car for it to turn over. I think it's like an anti-theft feature or what. If it's just the case that's broken just replace the case, got mine from here 3 years ago still has no issues, says it is USA made and looks beefed up compared to OEM quality. See in Amazon site.

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