Just had new cambelt/pulleys/tensioners fitted to my 2001 156 2.0 T/S.
After fitting, once the engine warmed a bit (5 minutes) and the "choke" setting turned off, the injection warning light would come on and the engine would misfire at approx 3K, with a slight clattering noise.
After the engine was warm to 70deg (about 10 minutes) it stopped misfiring and all seemed fine.
I took it back to garage a couple of days later and they disconnected the variator and asked me to test it for a couple of days.
Next morning all appeared fine - no misfire, no warning light.
They said it was likely to be the variator solenoid.
Took it back today and a s/h solenoid was fitted (not exactly the same type but "that will be fine").
Drove away, I noticed a very slight misfire at 3K was still there. Was just thinking "I'll turn around and tell them" when there was a clatter clatter and the motor completely seized. I had travelled about 1/2 mile.