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Old 05-31-2010, 11:01 PM   #1
alx8283
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Default 2002 wrx downpipe 02 sensor?

2002 wrx sedan
so i got my oem downpipe off and im ready to install the helix one. the aftermarket dp has what seems to be an extension for whatever sensor should be there (o2 sensor?). this "extension" threads into an existing, welding, threaded bung on the aftermarket dp. so my first question is: since ive rounded off the hex on the sensor in the oem dp (first using an o2 sensor wrench(22mm), then open end 22mm, then cresent, then cresent with cheater bar, then vice grips, then vice grips beaten with mallet...all after said sensor has been sprayed with pb blaster multiple times and allowed to sit overnight) and cant get it out, what is this sensor and how do i get a new one?

when i do figure out what the sensor is, do i use the extension or the existing welded bung? why, less "bad" emissions hit the sensor when the xtension is used? any and all help is greatly appreciated!



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Old 05-31-2010, 11:12 PM   #2
Uncle Scotty
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replace the


REAR OXYGEN SENSOR


sensor and done

Last edited by Uncle Scotty; 05-31-2010 at 11:25 PM.
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Old 05-31-2010, 11:23 PM   #3
alx8283
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thanks scotty, but what sensor is it? i cant find any part numbers and a google search of "2002 wrx rear sensor", "2002 wrx downpipe sensor", etc... yielded no useful results. i dont want to rely on some guy at the local dealership, as theyve proven unreliable in the past ("i can't do anything without the part number" -subaru parts guy).
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Old 05-31-2010, 11:41 PM   #4
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It's the rear O2 sensor - for an 02, that's p/n 22690AA501 for the 5spd and 22690AA591 for the automatic. The extension on there is a mechanical CEL fix - you put the new sensor into that.
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Old 05-31-2010, 11:43 PM   #5
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so just to keep bugging you, tio scotty, what about my inquiry regarding the extension on the helix dp, and since im a noob, why would i use or not use this extension?...thank you very much i just happen to be curious.
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Old 05-31-2010, 11:43 PM   #6
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thank you DrD!
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Old 06-01-2010, 02:04 AM   #7
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damn. when i went to take the 02 sensor out of my 61k mile no salt-road driven OEM downpipe, i might have applied 20lbs of torque and the bung broke clean off the stock cat on the o2 sensor.
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Old 06-01-2010, 02:18 AM   #8
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uuuh the extension looks like a mechanical cel fix, it keeps your rear o2 sensor thinking there is are no cats missing so it won't throw a check engine light
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Old 06-01-2010, 08:14 AM   #9
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Quote:
when i do figure out what the sensor is, do i use the extension or the existing welded bung? why, less "bad" emissions hit the sensor when the xtension is used? any and all help is greatly appreciated!
Hmm....I'm using the "extension" also....I've never fully understood how it works?

Quote:
Originally Posted by Uncle Scotty
replace the


REAR OXYGEN SENSOR


sensor and done
True.


Wait......no sarcasm?
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Old 06-01-2010, 08:56 AM   #10
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Can't you just plug the hole disable the code?
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Old 06-01-2010, 10:02 AM   #11
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Quote:
Originally Posted by MIKE DD View Post
Can't you just plug the hole disable the code?
that would be nice...new 02 sensor $115+
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Old 06-01-2010, 10:09 AM   #12
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I'm pretty sure that's what I did, or I'm missing something here. My XPT map has it disabled and I plugged it w/a Toyota drain plug.
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Old 06-01-2010, 10:20 AM   #13
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ill be running v1 accessport 91 octane stage 2, if i plug the bung, will the ap make everything bueno?
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Old 06-01-2010, 10:25 AM   #14
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Quote:
Originally Posted by alx8283 View Post
ill be running v1 accessport 91 octane stage 2, if i plug the bung, will the ap make everything bueno?
Ask them or wait for an answer here. I do not know.
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Old 06-01-2010, 10:28 AM   #15
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^ thats the plan...thanks!
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Old 06-01-2010, 11:41 AM   #16
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Quote:
Originally Posted by alx8283 View Post
ill be running v1 accessport 91 octane stage 2, if i plug the bung, will the ap make everything bueno?
There isn't a magic button on the AccessPort that will let you disable the Rear O2 sensor. You will need a specific map to disable it.

From the Downpipe FAQ:
Quote:
Originally Posted by Unabomber
What is the CEL fix? It stops the rear CEL code P0420 Catalyst System Efficiency Below Threshold from appearing, this code being caused by the lack of a catalytic converter in the exhaust. This is usually fixed with a Pony Express MIL Eliminator (no longer in business), Casper Electronics fix, or Perrin Performance fix. The 05+ does not currently have an electrical fix. Another fix is the mechanical fix, which works on all models.

***NOTE*** There are two CEL fixes for the WRX, the other one is the 2.2 KOhm 1/2 watt resistor. It is used to combat the CEL code P0546 = Exhaust Gas Temperature Sensor Circuit Malfunction (High Input) in the uppipe. This notice, though not important to this thread, acknowledges there are two "CEL fixes" and defines them individually to avoid possible confusion.

Many aftermarket engine management systems can also be used to prevent the CEL light from showing up.

Which is the best CEL fix, mechanical or electrical? Both work fine, though personnel living in states with OBDII testing prefer the mechanical fix. The reason for this is during state mandated OBDII testing, the electrical fix can show up as a malfunctioning sensor. For some states, this one malfunctioning sensor is fine, for others, you will have to fix it and return. In the end, the mechanical fix is cheaper and easier for most users.

Can I drive around with a P0420? Yes. This is not a code that will throw your car into limp mode, so you can drive normally with it until you get a CEL fix. It's never wise to do so though as a CEL is easily seen by police who may then do a "safety inspection" as well as cause issues during any local emissions testing.
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Old 06-01-2010, 11:55 AM   #17
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thanks...i shouldve thought to check the faq...i usually do...thanks again!
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