downpipe
Senior Member
Joined: 01-28-11
Posts: 734
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From: Rochester Hills, MI
It is the post cat o2 sensor giving you a catalytic converter inefficiency code. Don't worry because it has no effect on how the engine runs.
To fix it, drill out an 18mm spark plug non fouler with a 3/8" drill bit. drill all the way to the bottom but not all the way through so the little hole is still there. you can hold the non fouler pretty easily with a vise and drill through it with a hand drill. thread the non fouler on to the o2 sensor and install the assembly into the bung.
i first tried drilling the non fouler out all the way through, and still got the light. when i didn't drill through the small hole, the CEL went away after i reset the code. I have the same zzp downpipe with the 2.5" diameter. i would think you would probably have a lesser chance of getting a code if you have the 3" pipe. However, if you do have the 3" pipe, there may not be room to extend the o2 sensor out any more.
To fix it, drill out an 18mm spark plug non fouler with a 3/8" drill bit. drill all the way to the bottom but not all the way through so the little hole is still there. you can hold the non fouler pretty easily with a vise and drill through it with a hand drill. thread the non fouler on to the o2 sensor and install the assembly into the bung.
i first tried drilling the non fouler out all the way through, and still got the light. when i didn't drill through the small hole, the CEL went away after i reset the code. I have the same zzp downpipe with the 2.5" diameter. i would think you would probably have a lesser chance of getting a code if you have the 3" pipe. However, if you do have the 3" pipe, there may not be room to extend the o2 sensor out any more.
it'll be p0420 as mentioned earlier, due to your high flow cat. The anti-fouler method works fine to trick the o2 into thinking the stock cat is still there, 5-10 bucks at an auto parts store.
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Joined: 05-06-11
Posts: 64
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From: laval
Already been said...
It is the post cat o2 sensor giving you a catalytic converter inefficiency code. Don't worry because it has no effect on how the engine runs.
To fix it, drill out an 18mm spark plug non fouler with a 3/8" drill bit. drill all the way to the bottom but not all the way through so the little hole is still there. you can hold the non fouler pretty easily with a vise and drill through it with a hand drill. thread the non fouler on to the o2 sensor and install the assembly into the bung.
i first tried drilling the non fouler out all the way through, and still got the light. when i didn't drill through the small hole, the CEL went away after i reset the code. I have the same zzp downpipe with the 2.5" diameter. i would think you would probably have a lesser chance of getting a code if you have the 3" pipe. However, if you do have the 3" pipe, there may not be room to extend the o2 sensor out any more.
To fix it, drill out an 18mm spark plug non fouler with a 3/8" drill bit. drill all the way to the bottom but not all the way through so the little hole is still there. you can hold the non fouler pretty easily with a vise and drill through it with a hand drill. thread the non fouler on to the o2 sensor and install the assembly into the bung.
i first tried drilling the non fouler out all the way through, and still got the light. when i didn't drill through the small hole, the CEL went away after i reset the code. I have the same zzp downpipe with the 2.5" diameter. i would think you would probably have a lesser chance of getting a code if you have the 3" pipe. However, if you do have the 3" pipe, there may not be room to extend the o2 sensor out any more.
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