yes read all through EOBD & nothing stored since orginal code P0420,went down the air mass rote & tried swopping for known good sensor (no change),used gen jag sensors & all are switching ok & at correct voltages.
Now the freeze frame data at orginal fault on fuel trim read as follows
short term trim bank 1 = 1.6
long term trim bank 1 = -3.6
short term bank 2 = 6.3
long term bank 2 = -1.5
a wee bit of differance between banks but cant work out why?? this problem will only occur flat out up long steep hills,slow off & retry and all seams good? still scratching head!!!