Had this car in with poor running at light throttle
EML on scan revealed P0138 which on it's own I dont think would cause this issue.

Car has only done 12,000 miles

Scoped primary and got a bizarre pattern which seems to have the primary dwell period upside down ?

Scoped cam and crank at idle and it appears to be slightly out compared to a known good one, how much tolerance is there ?

Lambda bank 1 not moving from 0.4 volts until 1200rpm then switching normally

Any ideas appreciated