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This is a very rookie question, is the cylinder not firing because the ECU has turned it off, given that the coil and spark plug appeared to work ok in a different cylinder? I figured that even with a compression issue that it would still generate some force when the fuel ignited, but in this case it appears that there is no activity in the cylinder at all which I find confusing.
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If there has been oil starvation a valve (or valves) on cylinder two may have been damaged or even dropped and the
ECU may be able to detect that directly or indirectly (i.e cylinder 2's Knock Sensor) and cut off the fuel and or ignition to that cylinder. Ditto with seized ring(s) on cylinder 2; the knock sensor would detect it.
You might this recent Allan Howatt video interesting. While it's a diesel engine (albeit incidently also a Mondeo) it shows how oil starvation can impact one cylinder more than others. This ones is also relevant
https://www.youtube.com/watch?v=kCotRrU475M