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Third generation of the Ford Focus available in North America. Performance variants include the Focus ST (2012-2018) and the Focus RS (2016-2018).

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Why car key will not start car?

Why won’t my key start my 2015 Focus?

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Playing twenty questions gets old fast. Supplying descriptions in detail may reduce back and forth questions.

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Is it the original key? Have you changed the battery inside of it? Was the old battery leaking? Is any part of the inductive pick-ups broken? You may need it re-programmed by a locksmith.

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The keyless entry cars are... let's say, picky about voltage, even with a key backup due to how sensitive these cars can and will be. DO NOT gamble as you might with a normal car with a key; at least if I run a CR2032 dead in a 2008 Camry or key-based Silverado, I have a key to fallback on.

Start with a replacement coin cell (usually CR2032) and see what happens; if it remains, I have cleaned these keyfobs with CRC QD contact cleaner and brought them back to life (sometimes just long enough to use the "existing key" DIY procedure if it has one), but you don't always win.

If neither trick helps, see if reprogramming allows it to start again; if not, you need a new key or there's a disagreement with the immobilizer you can't easily reset with consumer-level tools unless you know someone with an Autel scanner who can do it for you.

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Faulty immobilizer units in these are a common problem too. They can be repaired or replaced & reprogrammed. Won't know which way to go without owner's feedback / more info.

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@automotive Heh easier to try and reset the immobilizer with the right scanner. If it still happens there’s a strong chance reprogramming is needed if it isn’t the key, or the module needs repair unless you can pair the new one to the ECU, and reprogram the keys.

The one I had luck with the contact cleaner was when I needed a key to program new keys for a GMT800, but it ended up fully repairing the keyfob.

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Generally Positive さん、ありがとうございました!
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