codes, help please

[RedBullitt]

hey all. i hope someone can help me out here.
i have an 01 gt and i have installed a bassani x and i keep pulling code p0133. Slow response from upstream o2 sensor drivers side. I do not think it is the sensor itself, because i have switched it and still had the same problem. I am pretty sure it is a problem sealing where the midpipe connects to the header. Would that make sense? Before this morning when i swapped a new gasket on the passenger side, i was pulling a p0153, same as now but with the passenger side. The only thing i could think of is that maybe the flange is not lined up quite right so maybe it is offset a little or something. so do you guys have any ideas on this? or a good way to fix it?

 

[tomustang]

try some MIL eliminators. you have an aftermkt setup and the sensors are use to the stockers.

 

[bdcardinal]

try some MIL eliminators. you have an aftermkt setup and the sensors are use to the stockers.

he cant use MILs because its an upstream (front) sensor. check the gasket that connects the manifold to the x-pipe.

 

[MT1083]

I had the same code and could never find a way to get rid of it. I just had to remove my x-pipe a few weeks ago due to fitment problems and emissions. If you get it fixed, please post and let us know what you did.

 

[RedBullitt]

i took it off once, the code was coming from the passenger side. after replacing the gasket on that side and reinstalling that side was fine, but i got the slow 02 sensor code on the drivers side. This makes me think it is the connection to the header. any ideas?