since i have and aftermarket down pipe and want to get a tune if i take the old o2 sensor out and put the wide band in it place would i have any problems because i throwing a po420 code now and want that remove wit the tune

 

you dont have a front O2 sensor now? you took it out to put the wideband in?

 

im guessing you do not have an extra bung for the wideband specifically, and assuming you have a cat? the problem is you want you wideband sensor approx. 18inches from the primaries, which puts you inside the cat of a stock dp. but you dont want your sensor after the cat because the reading will be a little off, so you put it just b4 the cat. and that is usually good.

so what i would do if i were you is get a bung insert and take the dp off, cut a hole and weld her on in there.

i know you can turn off the back sensor, but its probly better just to weld-in another bung.

 

either an O2 bung like kruillin said, or have someone with HPtuners delete your rear O2 sensor and add it there. would be better to add the O2 bung and keep the rear O2 sensor.

 

ok how much would it cost to get the bung weld in

 

not sure, i had mine put in from the company i bought my DPs from, hopefully another member will chime in. good luck!

 

This won't work. The rear O2 sensor measures the air AFTER the cat.

If he puts a wideband in after the cat his readings will obviously be way off. It has to go before the cat and the first sensor is too close to the head. His only real option given his current setup is to get one welded.

I had the AEM UEGO wideband and it came with instructions on where the bung needed to be located (how far from what and at what angle). If you have this same wideband, good, if not, I recommend looking these instructions up, then take it to an exhaust shop -- they should be able to put on in for you relatively cheap.

 

i paid like 10 bucks to get it on and did not had to take down pipe out