saxman Posted November 28, 2009 Share Posted November 28, 2009 This is on a 2005 Outback XT (Invidia DP). The spacer I got was off ebay and is "L-shaped". I actually had to lower the exhaust some to get it on the secondary O2 sensor due to its length. At first the CEL was alleviated for a good month or two. Recently, the CEL comes on within a few miles after I reset the ECU. I have tried turning the O2 Spacer in different directions (is their a correct direction it should face or does it matter... I can't turn it totally forward because it hits on the frame of the car). My other thought is that carbon buildup in the spacer is causing the issue. I did have an AccessPort which has been sold (yes I'd like to have it still but that's not possible at this point). I believe I've heard of people using a resistor in line with the wiring on the secondary O2 sensor to permanently fix the problem. Does the resistor fix always work and if so, what size resistor needs to be used and which wire do you tap into? Thanks Link to comment Share on other sites More sharing options...
grim Posted November 29, 2009 Share Posted November 29, 2009 Find someone with a Tactrix or Vag-com cable to reflash your ECU to ignore the P0420 CEL. You are wasting your time with spacers and wiring. Link to comment Share on other sites More sharing options...
Rancid Posted November 29, 2009 Share Posted November 29, 2009 Due to the open loop/closed loop fueling on 05+ Subarus, you really need to reflash your ECU with Cobb or OS tuning. Under boost, your car can run dangerously lean and the repairs will cost much more than the price of the $600 AP. Link to comment Share on other sites More sharing options...
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