That's what I've been afraid of. Do you also have a rattle coming from the engine as well, or just the pinging?
Mine has both and both disappear after warming up.
And I haven't gone to the dealer yet because it won't be doing it when I get there since the engine will be warm, then they'll want me to leave it. That would be fine, but then I won't know for sure if they will even drive it and acknowledge there is a problem.
My last trip was because of the...
I have the same pinging noise when cold and with minimal acceleration ( no turbo boost). Goes away after the engine warms up.
Will be watching this thread.