On Friday we saw USD/JPY failed to hold onto intraday gains above 158 following the BOJ meeting, and close the day back beneath the prior 'MOF intervention' level to form a shooting star candle.
Prices drifted higher on Monday on relatively low volume, putting us once again on guard for either a false break of 158 or Friday's high.
We're seeing a simple countertrend move back down to the high-volume node around 157.30 or even 157, should US data surprise enough to the downside later today.