zzp down pipe

**2005gt** · 01-03-2011

i got the down pipe with a high flow cat. and now to 420 code keeps coming on. its the old o2 in it still. how can i get ride of the code. the car is a 05 gt.

thanks for the help.

**TheOtherNick** · 01-03-2011

run a spark plug non fouler with the rear 02. google it. or have someone with a tuner delete the code

**2005gt** · 01-03-2011

i tride a spark plug non fouler. and it still come on

**01gpgt01** · 01-03-2011

Ive never seen the fouler not work. How did you put yours on?

**2005gt** · 01-03-2011

one was drill out and put the o2 in it . and put all in the pipe. it came with two . shuld i used both. this is what it looks like.

Universal Oxygen Sensor Simulator 02 Cel Fix O2 Spacer - eBay (item 270685385765 end time Jan-27-11 13:04:04 PST)

**01gpgt01** · 01-03-2011

yep, use One like that. that one has two combined

**2005gt** · 01-03-2011

ok il use both and i let you know. what happins thanks for the help.

**01gpgt01** · 01-03-2011

Good luck.

**Mjcanton** · 01-04-2011

Easiest way would have someone local delete the code if possible

**matt5112** · 01-04-2011

have you cleared the codes since you put the fouler in?

**TheManiac** · 01-04-2011

Most posts I've seen (and this is with high flow cats in general) people claim they tried one spark plug anti-fouler and it took the two. It's spacing the O2 sensor out of the exhaust stream to allow it to "read" what it thinks it need to read.
It will take a while for the car to clear the code on it's own. IMO clear all codes and start from a clean slate.

As stated, the best method is to delete the code from the PCM completely (but this can sometimes be costly just for a single code delete).

Best of luck!

**01gpgt01** · 01-04-2011

Originally Posted by Mjcanton

Easiest way would have someone local delete the code if possible

Wrong. not on a 2001 plus. Doing so COULD cause a over fueling issue because the car will still run the cat diagnostic but never complete it.

**blueguy** · 01-05-2011

Truth.

'01+ cars have a different fueling loop IIRC. Putting in a o2 sim KILLS MPG's OR makes the car run terribly lean...you never really know...it just does what it wants.

**Jakegday** · 01-05-2011

thanks, you f*ckers have me thinking now.... so this over/under fueling issue applies to me and my 2001, since the code and everything was deleted from the pcm?

edit: either way, i guess im not too worried. been going strong for over a year now. good gas mileage and all..

**matt5112** · 01-05-2011

my code is set to not report yet the O2 sensor is still there.

No issues thus far.

**Taz Magister** · 01-17-2011

Alright im having a heck of a time here Trying to use one of these on my 02 since theres no write ups on here i found one else where and they said to drill one out 1/2 and i did and my 02 still wont fit all the way in there how much do you drill it out? if someone could give me any tips it would be nice because i want to get this done today

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