The last time the BOJ intervened to sell USD/JPY the pair was above 145.70.
Its there again now. The difference this time (famous last words) is the US dollar is stronger across the board
- and the yen is a little better bid on the crosses
- and the USD/JPY move higher has not been extremely rapid
I suspect there will be verbal warnings from Japanese authorities though. Watch out for key phrases to indicate actual intervention is imminent, see here for example:
EUR/JPY is down from recent highs a touch: