What is the difference between the 02 sensor in the header and the 02 sensor after the cat? Other then the female and male ends. Thanks

Reason for this is because Im getting HORRIBLE mpgs and now have an check engine light p1133 for heated 02 sensor. I have 2 02 sensors laying around thats for the after cat sensor. So my question is, can I use the back sensor for the header sensor??
Thanks

 

the after cat moniters the cat efficsncy pre cat does afr

 

they most likely have different voltages output wise and the front sensor is a heated afr sensor

 

A 4-wire O2 sensor is a 4-wire O2 sensor, so you should be able to swap them. But as you already mentioned the connectors are different so you need to sort that out...

 

if that was true you would be able to use a o2 from any car and you cant there is some differences between pre cat and post cat o2 sensors and differences between car makers and and models