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O2 Sensors

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    Hello all! New to the site...quick question. How many O2 sensors does our car(05 TC) have? And Where are they located?
    There are two O2 sensors. One is on the exhaust manifold, before the pre cat, the second one is on the S-pipe.
    Thanks. That's odd. The reason I asked was because I just installed a Tsudo N1 exhaust and instead of a cat it said it was an 18 in resonator. Then after a couple of days my CEL came on. So is that why my CEL came on?
    This is actually what the description says for the exhaust...

    A resonator is used in place of the second catalytic converter.
    18" Resonator -> mid-pipe -> Axleback.
    J-Reezy wrote:
    Thanks. That's odd. The reason I asked was because I just installed a Tsudo N1 exhaust and instead of a cat it said it was an 18 in resonator. Then after a couple of days my CEL came on. So is that why my CEL came on?


    The 2nd O2 is before the primary catalytic converter anyway.
    Your CEL probably came on because your flow pattern which the ECU had learned shifted. Air was flowing at a faster rate over the 2nd sensor and it was likely reading carbon rich. Reset your ECU, and idle for 10 minutes, then drive it easy for 10 minutes. This should take care of that.
    Thanks again, I'll try that and get back to you. Thanks a lot for your help.
    No thanks needed
    ok, sorry to keep bothering you. I did what you said, the CEL light turned off, but now my head unit wont power on. Is this supposed to happen when you disconnect the battery?
    ^^^^^^ NO. When you disconnected the battery did your trip odometer reset? Did you have to reset your windows and sunroof? If not you didnt let the ECU reset. Try it again and leave it unhooked for about 10-15 mintues. and your trip should be at 0 and you shouldn't be able to roll down the windows from the driver side, so hold the window switch on the passenger side all the way up for about 3-5 seconds and for the sunroof open it to the full positon and close it fully then open it up again and the auto feature should work. Now as for your headunit if it doesnt work you mightof blew a fuse. If its aftermarket i would try to either detach the face and put it back or hold the power button. Im not sure about that. Someone with greater knowledge should be able to help you farther. But hope this helps
    nevermind... took care of. thanks.
    07TouringCoupe wrote:
    ^^^^^^ NO. When you disconnected the battery did your trip odometer reset? Did you have to reset your windows and sunroof? If not you didnt let the ECU reset. Try it again and leave it unhooked for about 10-15 mintues. and your trip should be at 0 and you shouldn't be able to roll down the windows from the driver side, so hold the window switch on the passenger side all the way up for about 3-5 seconds and for the sunroof open it to the full positon and close it fully then open it up again and the auto feature should work. Now as for your headunit if it doesnt work you mightof blew a fuse. If its aftermarket i would try to either detach the face and put it back or hold the power button. Im not sure about that. Someone with greater knowledge should be able to help you farther. But hope this helps


    Thanks. Yes I reset the windows and sunroof after I reconnected the batt. I just forgot to reset my head unit. Thanks tho, for your help.
    No problem buddy. That's what we are here for. Post if you ever need help again.
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