adi2009 Posted November 15, 2005 Share Posted November 15, 2005 Ok, what exactly does the sub-O2 sensor do??? Doesnt the ECU get the AFR reading from the Main O2 sensor itself? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 15, 2005 Share Posted November 15, 2005 It gives an after the cats O2 readings to the ecu. Quote Link to comment Share on other sites More sharing options...
adi2009 Posted November 15, 2005 Author Share Posted November 15, 2005 Thanks Chris, So after a decat etc would it really matter if you have a sub O2 sensor or not??? Quote Link to comment Share on other sites More sharing options...
LeeT Posted November 15, 2005 Share Posted November 15, 2005 It gives an after the cats O2 readings to the ecu. what does the ECU do with these readings? Quote Link to comment Share on other sites More sharing options...
SimonB Posted November 15, 2005 Share Posted November 15, 2005 I thought it was an ODB2 thing - for emissions reasons the ECU has to monitor the emissions systems and report a fault if they aren't working. In any case you have a Jspec so you haven't got a sub O2 sensor have you? Quote Link to comment Share on other sites More sharing options...
LeeT Posted November 15, 2005 Share Posted November 15, 2005 I thought it was an ODB2 thing - for emissions reasons the ECU has to monitor the emissions systems and report a fault if they aren't working. In any case you have a Jspec so you haven't got a sub O2 sensor have you? i have:) Quote Link to comment Share on other sites More sharing options...
Pig Posted November 15, 2005 Share Posted November 15, 2005 Same, all i know is mine is plugged in so would have thought its better to keep it. if there was no need then pheonix would not have put it in and the decat pipe would not have come with a place for it! Quote Link to comment Share on other sites More sharing options...
adi2009 Posted November 15, 2005 Author Share Posted November 15, 2005 Would be nice if someone could shed some light on this! Quote Link to comment Share on other sites More sharing options...
SimonB Posted November 15, 2005 Share Posted November 15, 2005 Would be nice if someone could shed some light on this! Why? As I say you haven't got one! Quote Link to comment Share on other sites More sharing options...
adi2009 Posted November 15, 2005 Author Share Posted November 15, 2005 Why? As I say you haven't got one! Ya, havent got one. But then again I have to clarify this because I am NA-TT so want to make sure everything that matters is in place! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 16, 2005 Share Posted November 16, 2005 Thanks Chris, So after a decat etc would it really matter if you have a sub O2 sensor or not??? Yes, it MUST stay in situ, the ecu will not like it being either disconnected or hung out in fresh air, it DOES tolerate it reading the same as the 1st sesnor, however, so you need a second cat pipe with the boss for it, on UK / US spec MKIV's, like the ones i make. Quote Link to comment Share on other sites More sharing options...
adi2009 Posted November 16, 2005 Author Share Posted November 16, 2005 Yes, it MUST stay in situ, the ecu will not like it being either disconnected or hung out in fresh air, it DOES tolerate it reading the same as the 1st sesnor, however, so you need a second cat pipe with the boss for it, on UK / US spec MKIV's, like the ones i make. So the J-spec's dont have the sub-O2 sensor then??? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 16, 2005 Share Posted November 16, 2005 No, they only have one O2 sensor Quote Link to comment Share on other sites More sharing options...
adi2009 Posted November 16, 2005 Author Share Posted November 16, 2005 Thanks a lot Chris Quote Link to comment Share on other sites More sharing options...
dangerous brain Posted November 30, 2005 Share Posted November 30, 2005 Where is it located though as i need to know before i can send you it. Quote Link to comment Share on other sites More sharing options...
adi2009 Posted November 30, 2005 Author Share Posted November 30, 2005 http://www.mkivsupra.net/vbb/showthread.php?t=52906 Quote Link to comment Share on other sites More sharing options...
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