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Old 07-02-2006, 05:03 PM   #1
Mr Nice Guy
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Default Stg 2 Problems and Cel not clearing

I have been running Stg1 for the past week with no problems. Thursday night I installed my Turbo back Exhaust (no cats). the only problem I ran into was that the rear O2 sensor was cross threaded into the pipe , thanks a lot Subaru, so I couldn't put it into the new pipe. No big deal I thought though since the STG2 map eliminates those cels. Well it ran fine on the Stg1 map but threw a CEL (0037 rear O2 not heating). I drove it easy until friday since I was still on STg1 map. When I got my AP back on Friday and reflashed stg2 the CEL went away but returned when I started the car. Hmmmm. Then I took it for a test drive and it had less power than stock and was running a little rough. I went back and reflashed stg1 and it drove as before. WTF? Is it possible that not having the rear O2 had anything to do with it? Shouldn't the AP take care of this CEL? I cleared it with the AP but it comes right back. Do I need to do the electrical fix or get a new O2? Also is there any reason STG1 would work fine but STG2 runs like crap? I used the one that was on the AP from the factory. Is it possible the map was bad? Anyone had this problem? I'll try downloading the newest one from Cobb. My WRX only has about 3500 miles and runs perfect so I don't think there are any problems with it. Any help would be greatly apreciated. Thanks in advance to the WRX gurus.
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Old 07-02-2006, 05:50 PM   #2
Master2192
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Are you loading the Stage 2 base map? Also, from what I'm seeing. The Stage 2 map doesn't defeat that particular O2 sensor code.

The list of defeated codes is at the bottom of this.
http://www.cobbtuning.com/wrx/access...20ProTUNER.pdf

I think you should get a new O2 sensor, but I don't know if not having it is affecting your performance.
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Old 07-02-2006, 05:55 PM   #3
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I think the sensor has to be plugged in for the ECU to reach the readiness then the AP keeps the light from coming on due to lack of cat efficiency. so you may have to figure a way to secure the sensor in place. Just my understanding, may be wrong.
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Old 07-02-2006, 05:56 PM   #4
06rexwagon
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be very careful running a stage 1 map with the downpipe. You can have severe boost spikes because of high wastegate duty cycles.
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Old 07-02-2006, 06:59 PM   #5
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Quote:
Originally Posted by 06rexwagon
be very careful running a stage 1 map with the downpipe. You can have severe boost spikes because of high wastegate duty cycles.
I just read the note about that on the stg2 map. I've been driving really easy. Not going above 3-4000 rpms and prolly only 25% throttle. Any idea why stg2 would have so little power? Could it be the whole tighten wastegate actuator arm thing? I think I'll have to reflash stg2 and see what boost the AP says I'm running. If boost is really low I guess that could be my problem. Can I do the Electrical cell fix instead of buying an O2 sensor since those are pretty expensive? Maybe I could plug the old one in but not put it into the pipe and just tie it up somewhere. Should I reflash the stock map before I drive any more or is taking it easy and staying out of boost OK? I don't want to damage anything. Thanks again guys
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Old 07-02-2006, 07:07 PM   #6
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[quote=Master2192]Are you loading the Stage 2 base map? Also, from what I'm seeing. The Stage 2 map doesn't defeat that particular O2 sensor code.



I did load the Stg2 map. It just seemed like it had no power.

Last edited by Mr Nice Guy; 07-02-2006 at 07:17 PM.
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Old 07-02-2006, 08:00 PM   #7
06rexwagon
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Stock map is safer than stage 1 for the dp. You don't won't to run with a hole in your pipe where your o2 sensor is supposed to go because it willl probably sound really bad (large exhaust leak). I wouldn't touch the wastegate arm either, because it introduce more problems. I wish I could help more, but I'm not sure why it's running so bad. The rear o2 is for emissions, not for adjusting afr, that's what the front o2 sensor is for.
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Old 07-02-2006, 11:30 PM   #8
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Quote:
Originally Posted by 06rexwagon
Stock map is safer than stage 1 for the dp. You don't won't to run with a hole in your pipe where your o2 sensor is supposed to go because it willl probably sound really bad (large exhaust leak). I wouldn't touch the wastegate arm either, because it introduce more problems. I wish I could help more, but I'm not sure why it's running so bad. The rear o2 is for emissions, not for adjusting afr, that's what the front o2 sensor is for.
I have a screw in plug in the hole where the O2 sensor is supposed to go. It came with my new exhaust so there is no exhaust leak. I'm gonna try Stg 2 again and see how it works. Does any one know if I can just plug the O2 Sensor into the plug and tie it up under the car somewhere and still have it read that it is there. The threads are stripped on it so I can't thread it into the hole where it should go. If this won't work is there a resistor or something that I can plug into the conector to make it think that the O2 is there? Thanks guys
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Old 07-03-2006, 12:18 AM   #9
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Darn I just checked and the HWG STG2 maps are only for the 05 and older. Why none of these maps for '06. If I have problems making boost do I have to adjust the actuator arm????
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Old 07-03-2006, 02:20 AM   #10
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Quote:
Originally Posted by Mr Nice Guy
Darn I just checked and the HWG STG2 maps are only for the 05 and older. Why none of these maps for '06. If I have problems making boost do I have to adjust the actuator arm????

NO!!!!!!!!!

Ya need ta get it running right---fix the problem....THEN worry about the farging rest of it
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Old 07-03-2006, 03:03 AM   #11
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I just reloaded the stage 2 from the web site on to my AP, reflashed my ECU and took it for a little ride with my brother watching the boost. It ran very normal feeling and had good power. He said max boost was about 14.XX Psi which would be in the range Cobb gives for their target peak boost. I don't know why it was running so weird last time I tuned it but it appears to be much better now. I still have to fix my CEL from the rear O2 but then I will be good. Thanks for all the help guys......Later
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Old 07-03-2006, 09:11 AM   #12
06rexwagon
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glad it's running the way it should. You'll see peak boost in higher gears under load.
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Old 07-12-2006, 02:39 AM   #13
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2006 Maps can be found here!!!
http://www.cobbtuning.com/wrx/accessport/25index.html

Just in case your are trying to load the incorrect maps.
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