Actually I think they did say combustion engines did stop working (though I only watched the first 12 minutes so far).
So far the working explanation is that "physics went crazy and no one knows why".
Personally, I'd be OK with them making no further attempt to explain it, and just leaving it as the main conceit of the show, or coming up with a really solid explanation. The only really bad option is an attempted explanation that makes no sense or is easily seen through.
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