By moving the secondary o2 sensor away from the direct path of exhaust flow and limiting what exhaust gas can get to the o2 sensor the ecu believes that there is a functioning cat still in the system.
I have confirmed that this works on our vehicles. I have logged over 600 miles on my car and still have no cel.
You now need to drill out 1 of the non foulers using a 1/2" drill bit. When finished this is what it will look like.
Available at your local automotive store. Spark Plug Non Fouler PN 42009 ($4.99 @ Pepboys)
