O2 sensor check engine light?

So I have an 02 GTI (1.8t) and I am running without a catalytic converter so I bought one of these spacers to try and rid my self of the CEL

http://store.42draftdesigns.com/O2-Sensor-Spacer_p_306.html

Apparantly I still need a cat; the spacer is meant to be used with high flow cats.

I ended up also replacing the rear o2 sensor. Before using the spacer I was receiving an obd code that made sense (catalytic deficiency or something) now I am getting codes

P0138 - Circuit High Voltage (Bank1, Sensor2)

and

P0141 - Heater Circuit Malfunction (Bank 1, Sensor 2)

I think this might be due to my test pipe; the pipe is oriented so that the o2 sensor bung faces towards the ground (o2 sensor faces up) so with the spacer installed a lot of water (I think?) is getting trapped in the spacer thus drowning the sensor and shorting it out? Could this be the case? I am not getting any cat. deficiency codes. If I had the test pipe turned so that the bung points up (o2 sensor would face down) would that help?

here is a pic (similar) of what I mean by o2 sensor bung facing downward

http://i96.photobucket.com/albums/l187/bboy_jon/0301001906.jpg

something like that...

Thanks

You need your CAT back. Your CAT converts unburned fuel into water along with evaporating it into carbon dioxide. If you don't run a CAT on modern vehicles at sometime you will get CEL's. Go get yourself a high performance CAT to get rid of your codes and get more power to your engine.
Franco

So is that what is causing those codes? The thing is, without the spacer, I received codes that claimed catalytic inefficiency...makes sense, but with the spacer installed, the sensor is shorting out...this is what I am wondering...

even with a high flow cat, I will still get the CEL, thats where the spacer comes in, but if water is still going to build up in the spacer, I would need to turn the pipe wouldnt I?

Your going to get water build up. It's worth a try to turn it, but I wouldn't count on it fixing your're CEL's. You might have to go back to OEM CAT if you still have CEL's .
Franco