It's fixed
It turns out the previous mechanic had screwed up the timing belt replacements. One belt was out by one tooth, another by two and the third belt was out by three.
Thankfully it wasn't enough to damage the motor just enough for us to spend AUS$1,200 tracking down their fuck up. $370 for a replacement O2 sensor and $830 for the KIA dealer to find what was actually wrong with it.
The mech that replaced the timing belts claims he had his guy double check the timing belts but I plan on getting them to refund the O2 sensor cost AND pay for the real problem to be found and fixed.
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