Just put a new crate motor in my 1998 blazer 4x4 and am having problems with it throwing bad oxygen sensor codes for bank one sensor one. I have replaced it two times already and it keeps coming on the day after i change it.Was wondering if anyone new what would cause it to keep tripping the code ?

 

What is the specific code (Pxxxx)? Is it relating to the heater or activity?

It is possible that the wiring harness was damaged during the engine swap...

 

dont think the wiring was pinched during motor replacement we made sure that everything cleared it is throwing a p0135 o2 circut heater sensor malfunction im lost and need help

 

Did you make sure to correctly connect all grounds?

 

checked all grounds metal 2 metal they are good any other ideas before i have to pay a shop money i dont have cause i just got laid off