I just got new brembo rotors and pads put on yester day and the mechanic ran the obd2 scanner and he said that i have an o2 sensor that is not working like it should,i am throwing throwing a CEL saying fuel system malfunction due to running to lean or too rich! the thing is i just put two new o2 sensors on when i got the greddy turbo put on and i have had the CEL since the turbo was put on. I was just wondering that since i have a high0flow cat and the tuner guy at the shop strapped the new o2 sensor outside the CAT and left the old one unhooked inside the cat,if it could be causing the CEL?? if not any other ideas of testing the o2 sensors to see if they are working??

thanks!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by joshcivic00 &raquo;</TD></TR><TR><TD CLASS="quote">I was just wondering that since i have a high0flow cat and the tuner guy at the shop strapped the new o2 sensor outside the CAT and left the old one unhooked inside the cat,if it could be causing the CEL?? if not any other ideas of testing the o2 sensors to see if they are working??

thanks!</TD></TR></TABLE>

your tuner guy is a moron, don't let him touch your car again. o2 sensors need to read exhaust gasses, that's the whole point of the sensor. if all its reading is fresh air, then its not doing anything. take the old one out and put the new one in its place.