1993 civic si

code 43 is fuel system related but in my searching many linked it to the o2 sensor...i have a test pipe on the car (was there when i bought it) which i think is the problem...i just wanted to make sure this is it before i tear anything apart

thanks for the help

 

It is most likely a faultly o2, not your test pipe.

 

for shure its the o2. happened to me twice.

 

43 Fuel supply system

 

any way to check to see if the o2 sensor is bad or should i just replace it anyways