Not misfiring - seems to be a little noisy on idle but that could be in my head.
Would need to hear a healthy 1*2 engine to compare
That dephaser is f**ked. The mechanic should've known that when he drove it in to the workshop
Their mechanic claims the condition of the dephaser can't be diagnosed
Tell him to read the f**king manual then because there's an entire page devoted to just that!
There's no way the timing will be right or would've been right when manually rolling the pulleys to check with that dephaser. Improper job done I'd say.
So they re-did the belt again for free and you've just had to pay for the dephaser?