Perhaps something in this thread will help: 
P0171 and P2096 + Question About Catalytic converters - SOLVED!
Bobby...
['07 FSXT MODding Journal] ['03 X MODding Journal]
P0171 and P2096 + Question About Catalytic converters - SOLVED!
Bobby...
['07 FSXT MODding Journal] ['03 X MODding Journal]