Hi All, I could do with some guidance. This car came in with mil light on but running good.On Manufacture side code 202 cat error. On eobd P0420 Catt efficiency below threshold. On freeze frame closed loop. STFT -25% LTFT4.7% Front oxy sensor .2-.75Mv volts and switching. rear sensor holding about.65-.75Mv. Check for air leaks and none found. Runs well. I take it stft at -25 means lean mixture? Using Snap on Solus. What do you think. Sorry could not take 4 gas readings. Machine getting repaired at the time. Regards Les