I have a ford escape 2002 well mantained i just cahnge the front convertor change the 2 sensor and seals and spart plugs and one coil, its not even a month i change it i have the ligth on again say convertor P0404 i think  bank 1/1 

I JUST CAN andertain how can be the converter if i just change it the entire muffler i change it a year ago. i had a cable in the coil 6 with back connection one mechanic say was the computer he just took me for stupid, i did change it. another said it the motor when i change the coil cable all when to normal  it drive well i just can comprehend why is the engine light on again?

please help, i idid when to florida twice is 220 miles.

please help it drive well dont get it ????

Al