P0420 Remedy (sparkplug non fouler)

001Stunna · Feb 25, 2014

Jimsun said:
I havent drilled the second hole but after clearing the code that same day and driving it for 2 weeks. It seemed to be holding up. Did a read via obd2 and it says its ready .

You won't have any issues with it and you'll pass the new etest with no worries.

Jimsun · Mar 16, 2014

Just an update I did pass. Thanks Lev

nathan007 · Mar 18, 2014

I did exactly what Jimsun did, thousands of miles and a gutted cat later, no CEL!

001Stunna · Mar 18, 2014

nathan007 said:
I did exactly what Jimsun did, thousands of miles and a gutted cat later, no CEL!

Yep, it's understandable for there to be no CEL as the O2 isn't right in between of the exhaust stream. Been like that for years on mine now...

98exsedan · Mar 30, 2014

So from what i have read this does work, has anyone had it not work for them? I removed the resonator and now i have the dumb code and didnt know if anyone had it not work for them... Also how do i know what spark plug non-fouler to get, and where to get them?

001Stunna · Apr 2, 2014

98exsedan said:
So from what i have read this does work, has anyone had it not work for them? I removed the resonator and now i have the dumb code and didnt know if anyone had it not work for them... Also how do i know what spark plug non-fouler to get, and where to get them?

18mm

any parts store that has them.