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Old 07-20-2008, 01:13 AM   #1
Scooby Newbie
Member#: 177805
Join Date: Apr 2008
Location: Down Under
2007 WRX

Default extending OEM o2 wire

Hi all.
I want to relocate my factory o2 wire.
OEM exhaust position was before the mid cat as illustrated in the pic below

Now I have a new Turboxs TBE but I have welded a bung before and after the cat.
I want to put the OEM o2 sensor after the cat and my zietronix wideband sensor before the cat.

I think the OEM o2 sensor operates 0v-1v.

will it just be an easy splice and solder job ?
I was advised to use crimp terminals.
anyone have any advice or experience to offer ?
here was the instructions (it was also to aid in avoiding the a CEL that appears when a new TBE is installed on an 06 wrx


The below threshold is due to there been no cat now before the rear sensor, it sees unburnt fuel 3 times on a cruise it sends the code off, if it keeps coming up, the fix is to put a bung after the mid cat and put the rear sensor after the the cat, wires need to be extended, and this is a 100% fixed cure.

The 06-07 seems to be more fussy with regards to this code than the pre 06 ecu's. disabling the code i believes doesn't allow it to be in close loop on cruise, but not something i have tested.


You can cut the wires and add more to the length, but don't solder them, just use crimp terminals, stainless wire doesn't read right when they are soldered.
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Old 07-22-2008, 09:48 AM   #2
Scooby Newbie
Member#: 177805
Join Date: Apr 2008
Location: Down Under
2007 WRX


jheeno is offline   Reply With Quote
Old 07-27-2008, 10:53 PM   #3
Scooby Specialist
Member#: 72234
Join Date: Oct 2004
Chapter/Region: South East
Location: S. FL... Now Fort Polk, LA
2004 WRX SRR


DO not cut or splice 02 sensor wires. You will make a poor decision by doing so. If you must extend 02 wires, buy a kit that plugs the harnesses. By all means do not cut and splice them even if you use solder.
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