# P0420

**URL:** <https://forums.speedlife.net/t/p0420/221015>\
**Category:** Canada Nissan Automotive\
**Created:** [March 6, 2012, 6:13pm UTC](https://forums.speedlife.net/t/p0420/221015 "2012-03-06T18:13:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![elmanaba](https://avatars.discourse-cdn.com/v4/letter/e/58956e/32.png) [@elmanaba](https://forums.speedlife.net/u/elmanaba)\
**Post date:** [March 6, 2012, 6:13pm UTC](https://forums.speedlife.net/t/p0420/221015/1 "2012-03-06T18:13:39Z")

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as i was driving today my 2003 2.5 altima, i got the P0420 code…  
i honestly have no idea what to do.  
can something give me idea of what this is and what to do…  
much appreciated  
thanks

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**Author:** ![Newf](https://avatars.discourse-cdn.com/v4/letter/n/e9c0ed/32.png) [@Newf](https://forums.speedlife.net/u/Newf)\
**Post date:** [December 13, 2012, 3:35am UTC](https://forums.speedlife.net/t/p0420/221015/2 "2012-12-13T03:35:11Z")

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Pre-cat converter,and maybe the 02 sensors,best off too google it there are many answers for it.Good luck