EvolNinja

iTrader: (22)

Ok, I got done with installing my 3" DP and Cat-delete lastnight. I took it for a drive with my wife around town and back. It seems fine. Today, I stop by the gas station and fill her up. It might be because I remove the gas cap before the engine is off but I did that before and nothing happens. I think it's because the DP is too close to the oil pan and tranny. When I get to work today, the CEL came on. I think the CEL is the "Service Engine Soon"??? Any ideas??

sleeper3

iTrader: (10)

May be an obvious question but did you do something to alter the reading of the second O2 sensor now that the cat is gone?

Redline-Z

iTrader: (1)

Yes and the code is P0420 and he needs a O2 fix.

vvhiteix

iTrader: (10)

your rear o2 sensor...needs to be further away from the exhaust gas...people sell them, here on the forum...i think i might actually have one....pm me

Redline-Z

iTrader: (1)

I bought my 2 at advance for like 5 bucks and drilled it out. There are numerous threads in the How-to secction.

vvhiteix

iTrader: (10)

yea...i bought mine at like pep boys or advanced...just forget the part numbers...but yes...the how to section will have it. so just check it out..

EvolNinja

iTrader: (22)

I dont' think I did anything to alter the O2 reading except that I remove the Cat so maybe there's too much hot air going to the second O2 sensor.

vvhiteix, so that means I have to seal the second O2 sensor bung and make a new one at a farther down the pipe?

EvolvedGTI

iTrader: (37)

What they are saying is you need to get two anti-fouler, drill them out and screw that into the second O2 bung. You then screw the O2 into this. This makes the O2 reads less of the gas, and the light will go away. Search for "O2 fix". it is really easy

sleeper3

iTrader: (10)

Like EvolvedGTI is saying, you can use the existing second O2 sensor bung, and install an anti-fouler plug that recesses the tip of the O2 sensor away from the exhaust stream. It usually looks something like this:

grillpt

iTrader: (24)

Your computer is sensing that you've removed the cat from your car. It doesn't matter where you bung it in, you don't have a cat. If you don't want to get the mechanical fix from PepBoys or Advance Auto, (which I couldn't because they didn't have any big enough) you can order them through Gruppe-S for like $13 shipped. Thats what I did.

EvolNinja

iTrader: (22)

Thanks to you all for your advices! Greatly appreciated for the quick help.

c_sautter

iTrader: (4)

https://www.evolutionm.net/forums/sh...d.php?t=208195

I bought mine at NAPA, the part number was cross referenced. I followed the "how to" and it works.

philevo

iTrader: (4)

just buy a CEL fix you will be fine. I had the same problem.

BBS

iTrader: (18)

Remember that this is a very primitive way to trick the car into thinking that the cat is still there. You may still throw a cel