Holfy92 Posted August 26, 2016 Share Posted August 26, 2016 Hi all, I've had my Zed for about 2 weeks now and loving it at the moment! A few days ago my engine light came on solid so I checked it on my code reader and it came up with P0420. 'Catalyst System Efficiency Below Threshold Bank 1' Can anyone please let me know what this is? I've read 02 sensors could be it? Thanks in advance Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted August 26, 2016 Share Posted August 26, 2016 Could be the cat or lack of a cat or perhaps the sensor. Just get an up rev and get them switched off. Quote Link to comment Share on other sites More sharing options...
davey_83 Posted August 26, 2016 Share Posted August 26, 2016 first action sensor as i take it you dont have decats or high flow cats....... Quote Link to comment Share on other sites More sharing options...
Stemo Posted August 26, 2016 Share Posted August 26, 2016 As ZMANALEX told, go with uprev and you dont have to worry about them anymore. If you are planning to do any mods or bolt-ons on the engine then do them before mapping. Now you could just try to reset the code if it is bothering you. Quote Link to comment Share on other sites More sharing options...
Holfy92 Posted August 26, 2016 Author Share Posted August 26, 2016 Thanks for the reply guys, car is all standard at the moment and I won't be doing an uprev any time soon till I do some mods. I also forgot to mention I reset the code once doing the pedal dance and the engine light came back on couple days later.....so I reset the code on my ODB reader instead. I guess I should try the sensors first? Where's the best place to get them from.... Quote Link to comment Share on other sites More sharing options...
GMballistic Posted August 26, 2016 Share Posted August 26, 2016 Thanks for the reply guys, car is all standard at the moment and I won't be doing an uprev any time soon till I do some mods. I also forgot to mention I reset the code once doing the pedal dance and the engine light came back on couple days later.....so I reset the code on my ODB reader instead. I guess I should try the sensors first? Where's the best place to get them from.... Zmanalex (above, post n#2) as he may have good used condition ones in stock. Failing that then Emperor Tuning (a trader on here ~ see the professional trader area) again for good used condition ones or Clark Motorsport for new ones. There are other traders who may be able to help if you have no success with those three so have a good search through the professional traders if needs be but those would be my first choices. Quote Link to comment Share on other sites More sharing options...
Stemo Posted August 26, 2016 Share Posted August 26, 2016 I bought ebay sensors for 27 pounds each and it has been a year and they haven't caused me any problems whatsoever..I might be lucky tho. Quote Link to comment Share on other sites More sharing options...
Holfy92 Posted August 28, 2016 Author Share Posted August 28, 2016 Thanks again guys for the helpful replies. I have no idea which side is Bank 1 on the cats, anyone know? Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted August 28, 2016 Share Posted August 28, 2016 Thanks again guys for the helpful replies. I have no idea which side is Bank 1 on the cats, anyone know? Bank 1 is driver's side on a RHD car. Quote Link to comment Share on other sites More sharing options...
yetirider575 Posted December 10, 2016 Share Posted December 10, 2016 FYI - this used to be my car - it actually isn't standard - it has a Milltek cat back and "]high-flow 200cell cats from Topgear. Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted December 10, 2016 Share Posted December 10, 2016 Refer to my post #2 and read this http://www.autocodes.com/p0420_nissan.html 1 Quote Link to comment Share on other sites More sharing options...
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