Hey, I just recently put on a new cat and because its just a straight pipe its throwing a O2 code. I know that there is nothing that I can do to get the check engine light to go away with this setup, but my question is ... I was told that since the sensor is not reading a 100 degree difference between the 2 sensors it's telling the ECU that I'm running lean ... and dumps more gas in. Is this true?

 

hey do you still have your stock cat? would you be interested in selling it to me?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 971ud3 &raquo;</TD></TR><TR><TD CLASS="quote">Hey, I just recently put on a new cat and because its just a straight pipe its throwing a O2 code. I know that there is nothing that I can do to get the check engine light to go away with this setup, but my question is ... I was told that since the sensor is not reading a 100 degree difference between the 2 sensors it's telling the ECU that I'm running lean ... and dumps more gas in. Is this true?</TD></TR></TABLE>
The secondary O2 sensor isn't used to determine fueling, so I would doubt that its absence would switch the ecu into open loop.

Sure you can do something about the CEL. You can:

1. http://www.importparts.com/imp...CG-28
2. http://www.ntpog.org/mods/fifth-afc/ecu.shtml
3. http://www.mileliminators.com/
4. do something similar to this: https://honda-tech.com/zerothread?id=221347
5. get a real high flow cat to replace the test pipe you installed.
6. reinstall your stock cat.