Darren. Just popped back in, so will read your post more carefully before a full post, but i never suggested disconnecting the ECU would clear STFT and LTFT,s that was MILAN so perhaps your should address that to him. If you re read the post i asked if the Snappy could re-set the adaption,s (STFT AND LTFT) which is where you came in. And i measure the pre and post (higher) cat temps to check if the cat is working HTH Kevin.