As far as I know, there is no way to determine, if valve clearance was checked in the past. You're lucky if you have precise maintenance record for that.
But with no other clue, assume it was never done.
That engine does not have a nock sensor. That is made with the spark plugs, and besides that, the engine needs only a 91octane unlead fuel as minimum requirement.
So, if you suspect something to be wrong with the nock sensing, then first would be new spark plugs.
Or you could take a look at ignition timing. To do that, you would set the Bridge at the OBD-Socket according to the Graphic under the engine hood, which you photographed, and then use a ignition timing stroboscope (sorry, I could not find the official expression for that in the dictionary - I hope, you guess what I mean...).
Something I forgot to translate before: Are you sure the clutch/transmission is ok?
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Cuore L251 Bj 7/2003, Automatik:  Ausrangiert, leider!
Citroen C1 Automatik BJ 2011: 
Mofa: Dreirad auf Basis eines Amsler-Pony, Verbrauch Zweitaktgemisch: <3.5l/100km.
Das grosse Artensterben auf dieser Welt wird den Menschen erst bewusst werden, wenn schliesslich auch der Tiger im Tank ausstirbt.
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