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Old 12-21-2011, 01:31 PM   #1
Wagon Of Fury
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Question Name that sensor ! with actual pics. CEL P0134 etc. 03 WRX

Backstory: Bone-stock, car runs fine, but recently started throwing P0134 for front 02 sensor input missing. CEL comes on within seconds of ignition. Already checked bus connectors to ECU, all snug.

Start poking around underhood in the turbo area, find this beauty wedged between the bracket and the fender.



The other end disappears under the heat shield and is tight.



Note that the entire engine came out of the car about four years ago after the bearings went and it was returned to bone-stock by a Subaru dealer. Since then its put at least 30k miles, so if this sensor was something important, I've been living without it for a while, and am just chasing my tail in regard to fixing the actual CEL problem.

1) What's that plug, where's it go, and do I need it ?
2) Opinions on it resolving the CEL problem

Thanks all.
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Old 12-21-2011, 01:44 PM   #2
BlazeRex
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EGT sensor. If its tuned, its not needed.

If it is stock, then plug it back in.

It plugs in at the bottom plug connected to that metal bracket right in front of it
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Old 12-21-2011, 02:13 PM   #3
Wagon Of Fury
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Quote:
Originally Posted by BlazeRex View Post
EGT sensor. If its tuned, its not needed.

If it is stock, then plug it back in.

It plugs in at the bottom plug connected to that metal bracket right in front of it
Ah. OK I fibbed, the car still has its gauges leftover from its Stage 4 glory days, including EGT. That explains that.

One more thing regarding the CEL - this cable is snug and rubbing against the heat shield. Looks like some of the heatshrink has gotten toasty.

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Old 12-21-2011, 02:18 PM   #4
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replace the front o2 sensor
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Old 12-21-2011, 02:36 PM   #5
Wagon Of Fury
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OK, thanks Uncle. Will order this ASAP (Denso 2349011)


I've pored over the many P0134 threads, and some ppl have replaced it multiple times. Ugh. Just doing this to pass state inspection. Car runs fine.
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Old 12-21-2011, 02:45 PM   #6
Uncle Scotty
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if the wiring is bad somewhere...that may be an issue...but if that sensor is more than 4 or 5 years old...it is likely toast and the issue


dont let the cable rub the heatshield
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Old 12-21-2011, 03:17 PM   #7
Wagon Of Fury
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Quote:
Originally Posted by Uncle Scotty View Post
if the wiring is bad somewhere...that may be an issue...but if that sensor is more than 4 or 5 years old...it is likely toast and the issue

dont let the cable rub the heatshield
Yeah, I'm going to ziptie it out of the way as best possible.

I've done brakes (pads, rotors, caliper exchange) so I think the O2 sensor is within my mechanical abilities.
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Old 12-22-2011, 03:55 PM   #8
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Front 02 sensor is easy. You just need to remove the FR wheel and the fender liner to get to the sensor. Mine went out on my 03 a few years a go and I replaced it. Now the cel is back and I have to replace it again. If you don't have the socket to remove the sensor you can rent one from Autozone and then they will refund the deposit when you return it.
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Old 12-22-2011, 04:05 PM   #9
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Quote:
Originally Posted by Mr.Sparkle View Post
Front 02 sensor is easy. You just need to remove the FR wheel and the fender liner to get to the sensor. Mine went out on my 03 a few years a go and I replaced it. Now the cel is back and I have to replace it again. If you don't have the socket to remove the sensor you can rent one from Autozone and then they will refund the deposit when you return it.
Sweet, thanks ! Funny thing about AutoZone, their web Price (which I assume is the same/ballpark of their B&M price) is almost TWICE RockAuto - $230ish vs. $116+ s/h. Daaaaayumm.

Better not tell them that when I rent the tool from them, heh
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Old 12-28-2011, 04:49 PM   #10
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Urg. Got everything in place, got the crow's foot adaptor (thanks Subaru for not providing a straight shot) and this thing is on tight, then again its been there for almost nine years. Arrgh.
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Old 12-28-2011, 05:01 PM   #11
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Quote:
Originally Posted by Wagon Of Fury View Post
Urg. Got everything in place, got the crow's foot adaptor (thanks Subaru for not providing a straight shot) and this thing is on tight, then again its been there for almost nine years. Arrgh.
get some liquid wrench and apply it and let it sit overnight

get a regular box end wrench and put the cable through the opening and beat **** outa the wrench with the biggest hammer you can find

it will come out or you will break something......
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Old 12-29-2011, 07:08 AM   #12
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Quote:
Originally Posted by Uncle Scotty View Post
get some liquid wrench and apply it and let it sit overnight

get a regular box end wrench and put the cable through the opening and beat **** outa the wrench with the biggest hammer you can find

it will come out or you will break something......
In the ~3 hour gap between posts, LW worked its magic and I was able to do exactly that. Well, minus the hammer part

Hooray for not paying 100% dealer markup on the part + at least an hour labor !

Car runs smoooooooth, man, reall smoooooth.
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Old 01-03-2012, 05:44 PM   #13
fiveightandten
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Nice job. Penetrating oil is no joke. I'm partial to PB blaster. It works great.

Do yourself a favor and cut a notch in the heat shield around that sensor. If you ever have to remove it, you won't have to pull the sensor first. Also, it will provide easier access to the sensor.

FWIW, they sell O2 sensor sockets. It's a big socket with a notch cut out for the wires to hide in while you loosen it up. They work quite well in most instances, though clearance is tight over there.
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Old 10-05-2012, 04:47 PM   #14
andybuonviri
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Default 04 Wrx Cel (p0134)

I tried to post this as a new thread but the forums decided I was too much of a noob and would not let me.

I have a mostly stock 2004 WRX which has had no problems whatsoever aside from routine maintenance items for the first eight years. Recently I got a check engine light, code P0134. It is not consistent. Sometimes the car starts up and the indicator does not come on, other times it does. The car runs perfectly fine in either case.

I saw a post somewhere saying that the sensor is on the driver's side of a 2002 near the wheelwell. The pics in this thread of a 2003 look more like the passenger side of my 2004. Could someone with a 2004 help me locate this O2 sensor?
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Old 10-05-2012, 07:40 PM   #15
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Quote:
Originally Posted by andybuonviri View Post
I tried to post this as a new thread but the forums decided I was too much of a noob and would not let me.

I have a mostly stock 2004 WRX which has had no problems whatsoever aside from routine maintenance items for the first eight years. Recently I got a check engine light, code P0134. It is not consistent. Sometimes the car starts up and the indicator does not come on, other times it does. The car runs perfectly fine in either case.

I saw a post somewhere saying that the sensor is on the driver's side of a 2002 near the wheelwell. The pics in this thread of a 2003 look more like the passenger side of my 2004. Could someone with a 2004 help me locate this O2 sensor?
It's absolutely on the passenger side. Maybe a picture got reversed, or some n00b from General got loose and started telling fairytales. The thing to keep in mind with Subarus is that they changed very little from early 90's through mid-late 2000s. The thing with this CEL in particular, I would clear it with my scantool, unplug, start the car... BAM ! back on again within seconds. Car didn't even have to move.
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Old 10-09-2012, 11:13 AM   #16
andybuonviri
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Mine seems to come on when the car has been sitting for a while, and always stays on for that entire driving cycle. If I park, run into the store to grab a drink, and start it back up within a few minutes, the CEL doesn't come back on. Then the next day when I start it again, it does.
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Old 10-09-2012, 12:21 PM   #17
dangerousatom
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Quote:
Originally Posted by andybuonviri View Post
Mine seems to come on when the car has been sitting for a while, and always stays on for that entire driving cycle. If I park, run into the store to grab a drink, and start it back up within a few minutes, the CEL doesn't come back on. Then the next day when I start it again, it does.
Its prob due to oil and other gunk building up in the exhaust system before the turbo, and is getting all burnt up and collecting on inside of the UP. Short running around town trips dont let the exhaust heat up to burn it all out. Then it slides its way down the UP and can collect on the O2 sensor or just south of it and then gets blown all over it.

Other contributors to this are :
-slow turbo oil or coolant leak
-long term stuck open PVC valve....but you should have a few weird EVAP codes if that the culprit.
-exhaust valve seals are leaking oil after shutdown......doubt it.

any of these symptoms will result in a nice plumb of blue or white smoke on start up and sudden hard throttle

-
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