Oleschool Posted July 21, 2014 Share Posted July 21, 2014 My PF is throwing a P0420 for Bank 1.Can anyone recommend the best place to buy replacement cats besides the dealership? Link to comment Share on other sites More sharing options...
CNAM Posted July 21, 2014 Share Posted July 21, 2014 Catco.com has them for us. Slightly cheaper. Esp if you are not in CA. Is it for sure not just the o2 sensor? Link to comment Share on other sites More sharing options...
Oleschool Posted July 21, 2014 Author Share Posted July 21, 2014 I don't know if its an O2 sensor.I've been told that if an O2 sensor is bad the readings will be significantly different than the others.In this case it is pretty close.I've also read a post somewhere that said the cats were almost always faulty when this code came up.My cat on the pass side is cracked,which I believe to be a Nissan TSB.There is a band type clamp around it with some sealer on it. Is the pass side Bank 1 or is it the drivers side? Link to comment Share on other sites More sharing options...
johnbalderas89 Posted November 9, 2014 Share Posted November 9, 2014 Passenger side is bank 1 Link to comment Share on other sites More sharing options...
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