tdvs Posted November 24, 2008 Report Share Posted November 24, 2008 Eliminated the cat. Should I remove the O2 Sensor also, or at least unplug it? Tom Quote Link to comment Share on other sites More sharing options...
ismellrealbad Posted November 24, 2008 Report Share Posted November 24, 2008 what car? more importantly just what year is it? if its after 96 you got obd2 and you have a sensor after the cat. to elminate the check engine light and pass emission testing youll need to either plug in a 'spoof' to trick the pcm (computer) in thinking its there or youll need the pcm reprogrammed to think the sensor is there Quote Link to comment Share on other sites More sharing options...
BXX Posted November 24, 2008 Report Share Posted November 24, 2008 sensor Quote Link to comment Share on other sites More sharing options...
Andrew Posted November 25, 2008 Report Share Posted November 25, 2008 never leave the 02 sensor that comes before the cat unplugged. Quote Link to comment Share on other sites More sharing options...
jeremy Posted November 25, 2008 Report Share Posted November 25, 2008 if you are talking about the 2nd sensor immediately after the cat, the easiest bypass is to have that code removed with a PCM flash Quote Link to comment Share on other sites More sharing options...
1990lumina Posted November 25, 2008 Report Share Posted November 25, 2008 Second easiest is a set of spark plug non foulers being installed, and the O2 installed into it. Works great for about $10 Quote Link to comment Share on other sites More sharing options...
tdvs Posted November 25, 2008 Author Report Share Posted November 25, 2008 It's a '95 3.4. Not having any problems. Seems to run just fine. Just wondering if it makes any difference having the censor still hooked up now that there's no cat. Thanks to all who have responded so far. Tom Quote Link to comment Share on other sites More sharing options...
Brian P Posted December 11, 2008 Report Share Posted December 11, 2008 A '95 3.4 you should just have the one upstream O2 sensor. Leave it plugged in and normally installed. It is the only way the PCM can determine if fueling is correct. Quote Link to comment Share on other sites More sharing options...
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