Posidrive Posted July 26, 2017 Share Posted July 26, 2017 Just had the MOT testing station call to say that the emissions are failing on CO. Bouncing between 0.28 and 0.80 % at fast idle. No engine warning light, any idea what the cause could be? Quote Link to comment Share on other sites More sharing options...
Posidrive Posted July 26, 2017 Author Share Posted July 26, 2017 Just in case anyone has any ideas here's a bit more info Problem at idle after starting the engine from warm with idle at about 750 rpm The front bank of o2 sensors (both sides) continuously read rich and the rear bank lean Front left hand o2 sensor has constant voltage of 0.28 V with occasional fluctuation to 0.29 V. Right hand sensor has same general but fluctuation is between 0.36 and 0.37 V Quote Link to comment Share on other sites More sharing options...
Posidrive Posted July 27, 2017 Author Share Posted July 27, 2017 In case it helps anyone in the future, just had her smoke tested. Leak somewhere in the line that recycles the fuel tank vapor vent back to the engine. Plugged it temporarily and emissions spot on. Suspect that the O2 sensors are a badly fouled and a little lazy though, these are the originals after almost 160k 1 Quote Link to comment Share on other sites More sharing options...
Jay84 Posted July 27, 2017 Share Posted July 27, 2017 Glad its sorted. I asked my tester and he said its likely a fueling issue or 02 sensors. Quote Link to comment Share on other sites More sharing options...
NissanGB Posted July 27, 2017 Share Posted July 27, 2017 Hi Posidrive, we're glad to hear your issue has been sorted. If you do need any further help please don't hesitate to get in contact with our customer services team on 0330 123 1231 Thanks ^Molly 1 Quote Link to comment Share on other sites More sharing options...
veeg33 Posted July 27, 2017 Share Posted July 27, 2017 ^^ ??? NissanGB,...... 1 Quote Link to comment Share on other sites More sharing options...
Jay84 Posted July 27, 2017 Share Posted July 27, 2017 Just now, veeg33 said: ^^ ??? NissanGB,...... Glad to have them on board lol 1 Quote Link to comment Share on other sites More sharing options...
veeg33 Posted July 27, 2017 Share Posted July 27, 2017 1 hour ago, Jay84 said: Glad to have them on board lol Legit Nissan contact number... Well, NissanGB is a member since 2012, only 2 posts so far....Nissan must be desperate........or someone just got bored........or someone found a user name and password Quote Link to comment Share on other sites More sharing options...
Posidrive Posted July 27, 2017 Author Share Posted July 27, 2017 Anyone know the part numbers for the Bosch, NGK or Denso plug in equivalents for the pre-cat sensors (no splicing, same plug). I have a trip to the US coming up and might make sense to do a bit of shopping Quote Link to comment Share on other sites More sharing options...
Posidrive Posted July 28, 2017 Author Share Posted July 28, 2017 Bosch part seems to be OE BOSCH 0258007240 Anyone installed one of these? Quote Link to comment Share on other sites More sharing options...
andybp Posted July 28, 2017 Share Posted July 28, 2017 2 hours ago, Posidrive said: Bosch part seems to be OE BOSCH 0258007240 Anyone installed one of these? easy to change just a bit awkward to get to, get a proper o2 sensor socket it will make it a lot easier as they tend to be a bit tight Quote Link to comment Share on other sites More sharing options...
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