Diane Posted January 20, 2017 Report Share Posted January 20, 2017 I have a code that keeps coming up and it is po420 does anyone know what this means Quote Link to comment Share on other sites More sharing options...
tomada3 Posted January 21, 2017 Report Share Posted January 21, 2017 got v6 grand voyager code is for cat below threshold bank 1this comes up on mine but i reset code and then goes away reset mine just before my mot in december and still past emissions to reset disconnect battery for couple minutes then see if it comes back reset mine about 4 times it doesnt hurt my emissions or fuel economy if it persisits get your cat checked Quote Link to comment Share on other sites More sharing options...
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