I have a 99 civic si with cel. the code is P0133. I've changed the o2 sensor twice. I even took it to the dealer and they read the same code gave me a new sensor, saying that it is just a lazy sensor or that the headers might be the problem? I have JDM ITR headers, but I don't think that's the problem since I've had them on for 3 years. Can you guys help me with this?

 

stupid question but have to start somewhere. did you reset the CEL?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kris K. &raquo;</TD></TR><TR><TD CLASS="quote">stupid question but have to start somewhere. did you reset the CEL? </TD></TR></TABLE>

That was going to be my first question.

My next is did you look at the harness leading from the sensor? Be sure it's not open/grounding itself.

 

I've cleared it, but then it would come back within 2-3days. I also check the wires to see if they are open, but they're not.

 

exhaust leak, you're in need of a tuneup, sticky injector...

 

he might be using a test pipe
and that what is etting it up
JDM ITR header needs 2.5 collector so u would need a test pipe or a JDM cat

 

i'm actually using the stock cat that was fitted for the 2.5 collector. It's welded so their might be a leak. I'm going to have to check that. thanx