There was a code, just the AA guy didn't know how to read it. You cannot 'turn off' the CEL without clearing a code, so he cleared all codes and the light went out.
I suggest you get a decent code reader, your car is old enough to probably start to throw codes - especially emmissions related stuff.
Of course, when the AA guy disconnected the battery to clean the posts and wires, that would also have cleared any outstanding codes. But I suggest not doing that until you know what the code is, it could make the situation worse in a week or two.
Klaus
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Proud owner of a 220S. If I had more room, I would have more Volvos.
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