for those who want to run "catless" this is what needs to be done to keep that pesky Check engine light off. this should work on 99 to present and is 100% revesable
- 7/8" wrench or 02 remover wrench
- 2 sets of 2 18mm Spark plug non-foulers (NF for short) Napa part # 730-2442 About $7 a pack
- 1/2" drill bit
The NFs look like this:
They are the same 18mm threads that are used for the oxygen sensors. After opening the package you will notice that the hole on the bottom of the NF is quite small. You will have to drill out the the hole larger on 2 of the NFs (1 for each side) to 1/2". Should look like this:
You will then have to remove the rear most Oxygen sensor on each side. To do so first unclip it from the harness so the wires don't get all twisted when you start threading it out. Then simply use your 7/8" (or O2 remover) and thread it out. It will probably be rusted in there and a pain to get out WD40 or some other penetrating lube should make your life easier. After removing the O2 sensor, it should go together like this, and should only go together one way. Thread the drilled out non fouler onto the o2 sensor and then the other one that was not drilled out onto the drilled out one. Should look like this:
From Left to right it goes: untouched NF, Drilled out NF, and O2 sensor.
Just repeat the steps for the other O2 sensor.
All you will then need to do is reinstall the O2 sensors into the exhaust pipe, plug them back in, and reset the computer by unhooking the battery and hooking it back up. Should look like this installed:
This mod is 100% reversible and has been working like a charm for me on my truck for about the last week. Typically after resetting my computer, for whatever reason, the SES light comes back on within 24 hours in my daily commute.
I would imagine that this will work on the 04+ models as well