Reddit reviews Dorman 42009 Spark Plug Non-Foulers - 18mm Gasket Seat, 2 Pack
We found 5 Reddit comments about Dorman 42009 Spark Plug Non-Foulers - 18mm Gasket Seat, 2 Pack. Here are the top ones, ranked by their Reddit score.
Corrosion-resistant designBacked by team of engineers and quality control specialists in the United StatesAvailable in a range of sizesNon-Foulers help protect spark plugs from damageTrusted by professionals - Dorman is a 100-year-old brand used by millions of automotive experts every day
If this doesn't work if you put it on your post-cat O2 sensor, then it's the sensor that's bad. If it does work, chop out the cat because the cunt's fucked and probably clogged enough to get some decent gains. If you have to pass inspection, replace it with a cheap glasspack from Autozone or something, one of the short ones that will fit inside the heat shield, then drive some gravel roads to cover the shiny-ness.
Yup, just did mine no problem a couple weeks ago no check engine light.
I bought the vibrant header from redline360 online. The vibrant header comes with an o2 sensor relocation kit.
My corksport exhaust had a bung ready to go for the o2 sensor (just past the second cat. I actually put a vibrant ultra quiet resonator where that second cat used to be).
I bought this anti fouler off amazon. Then I followed these instructions.
End result: BAM no check engine light, it's a little bit louder than with just the corksport exhaust. But it is very worth it.
Edit: To clairfy all the anti fouler does is take the 2nd o2 sensor an inch further away from the exhaust. Thus it reads less pollutants than #1 o2 sensor and tricks the car into thinking the cat is working.
Also disclaimer, this is all for an '04 2.3L
https://www.amazon.com/Dorman-42009-Spark-Plug-Non-Fouler/dp/B000CO91FY
I'm running this with my catless downpipe. I have a tune but have them leaving the o2 sensors on so i can pass emissions. I have no issues with check engine lights or anything and have been running it like this for about a year now. For the visual inspections i think you should be good since the location of the cat is high up and behind a cross bar it is not an easy one to see from under the vehicle.
One thing to be aware of is the smell, it will smell like exhaust in the cabin every once and awhile. Nothing that is dangerous just something to be aware of.
P0420 is for emissions failure and usually a catalytic converter problem. The first thing I would try is to replace the rear O2 sensor. These can be had for about $50 on Amazon or RockAuto. Reset the ECU by removing the negative lead on the battery and holding the brake pedal down for 30 seconds. Reattach the negative lead and drive it for a few days to see if it comes back. If it doesnt, your golden. If it does it could be the Cat. If you are strapped for cash and cant really afford a new cat at the moment, there is a trick you can do by using two sparkplug non-foulers to pull the O2 sensor out of direct airflow in the exhaust.
Here is a LINK to the non-foulers i used when my Subaru gave me this code. There is a review on the link that shows what someone did to make this work.
If all else fails you will most likely need a new Cat.
If your downstream o2 sensor is matching the data your upstream sensor is reading, the computer thinks that the catalyst is not doing its job. You need to remove the downstream sensor from the raw exhaust stream. You can do this by purchasing a set of Spark plug non foulers. You then drill one out so your o2 sensor will fit inside. Then you screw the second non fouler onto the end of the first one, and reinstall into the exhaust pipe. Should look similar to this. Pull your negative battery cable before starting, and the CEL should not come back.