Quote Originally Posted by Tech5 View Post
I have worked on many car makers with O2 sensor codes, CEL and never had one cause it to run bad. Maybe if the tune up was shitty I could see that issue.

But never a O2 sensor making it run like shitt. But yes making it use gas Oh yeah
someone told me they is a dumby o2 you can use to fool the ecu is that true ?
Cause im getting a full catback from the header-back and it has no o2 port but my car needs one