i have a 97 fi50 with 5.4, it idles real rough. the scan says p1152 lack of ho2s21 switch sensor indicator rich. i was told to replace the driver side front o2 sensor. i did that disconected the battery cable to reset. the check engine light went off but the truck still idles rough. what could be the prolem? i did notice the catalitic convertor on that side makes a rattling noise,can anyone help?

 

I would change both 02 sensors,and chk the plugs ,if they haven't already been changed! sometimes the vehicle has to be driven a while for the computer to relearn the inputs from sensors.
after changing the 02 sensor and restting did you scan for codes again?

Rich




Ford Trucks Built Tough!
not with rocks
Watch out "X" Mayor of Truckville

 

i didnt scan for codes again because the check light has not came on again yet. thanks for the info.