N Nassim L Guest Jul 11, 2009 #1 I have a PO420 code. About a month ago, i had a new O2 sensor put in. 2 days ago, It came on again. Is there another O2 sensor I need to replace?
I have a PO420 code. About a month ago, i had a new O2 sensor put in. 2 days ago, It came on again. Is there another O2 sensor I need to replace?
