Parts Needed: ( 20 dollars if u dont have bits or compressed air.)

18mm Spark Plug Non-Fouler (come in 2 per pack)
Avail at local auto store (5 bux)

7/16th drill bit (5 bux)

Compressed air (outta can will work) (5 bux)

7/8th wrench (o2 socket will not work) (5 bux)

Drill

How To:

Jack up car
locate 2nd o2 sensor harness and disconnect
Grab 7/8th wrench and remove sensor
Take non fouler out of package and secure (preferably in
a vise) and drill out the inside of the non fouler. (if u try
to screw in o2 into non-fouler ull see y) just a bit needs
removed. DO NOT GO ALL THE WAY THROUGH THE NON
FOULER. You just need to open up the inside of the non
fouler so the o2 will fit inside it.blow out shavings with air.
Screw in o2 into non fouler then install non fouler into o2 bung


* May not work if u dont have an extra 3/4" of clearance around o2 sensor, u can get an exhaust shop to install an extra o2 bung if u need the clearance and u can plug the extra bung with an oil drain plug of m18x1.5


With this mod the o2 get heat for the heater circuit still reads a minimal amount of exhaust (just the tip of o2) making it seem to the 02 there is a difference from o2 #1 t o2 #2.

 

That's the procedure, so what's your question?

I tried this on my Mazda beater, though, that I gutted the cat, and it didn't stop the CEL. Supposed to work on the Z, I guess, though.

 

just asking if thats how its done

 

Ah, then, yup, that's how it's done.

 

well for me i drilled it with a 1/2 inch.

 

Yes, that it the way - you can also buy two sets of the non-foulers, drill one set all the way through and screw it into the other set and just screw the O2 sensor into the one that was drilled out fully. It's easier on the drilling out portion.

Rick