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Old 10-30-2011, 01:37 AM   #1
Strider327
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Default o2 Sensors for an 04 wrx?

Which part number is for which? I am looking at the Bosch website and they give two different part numbers. However when I look it up, it doesn't look like it will fit. I have a 2004 4eat wrx. I got a code for P1039 today.

13538 Oxygen Sensor OE Type - Downstream Automatic Transmission
15537 Oxygen Sensor OE Type - Upstream Automatic Transmission

I need the one for the downpipe. I would assume its the downstream one, however when I saw it on Amazon the head of the sensor doesn't seem correct.
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Last edited by Strider327; 10-30-2011 at 01:49 AM.
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Old 10-30-2011, 12:49 PM   #2
Strider327
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bump! Anybody?
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Old 10-30-2011, 01:55 PM   #3
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Is that an 02 code? What does it say after the code is read..
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Old 10-30-2011, 02:03 PM   #4
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Is the Bosch an oem replacement? I only ask because I have an 04 sti and mine was a Denzo. I replaced mine a couple months ago, and when I was looking for a replacement found a denzo for a lot cheaper.
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Old 10-30-2011, 02:06 PM   #5
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Your best bet is to just pop it out and look at it, (if you haven't already) then compare to the pictures online. But like I said you may want to look at the Denzo. Hope it helped.
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Old 10-30-2011, 02:57 PM   #6
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Old 10-30-2011, 03:23 PM   #7
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Thanks that helped me too
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Old 10-30-2011, 04:40 PM   #8
Strider327
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So this sensor is for the rear (downpipe) correct? Does anyone know the one for the manifold? The front one?
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Old 10-30-2011, 06:02 PM   #9
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Quote:
Originally Posted by Strider327 View Post
So this sensor is for the rear (downpipe) correct? Does anyone know the one for the manifold? The front one?

Possible your cat is clogged my girls audi threw the rear 02 code when it was clogged
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Old 10-30-2011, 06:56 PM   #10
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Originally Posted by Dat8687 View Post
Possible your cat is clogged my girls audi threw the rear 02 code when it was clogged
I have no cats.
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Old 10-31-2011, 09:06 AM   #11
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Quote:
Originally Posted by Strider327 View Post
So this sensor is for the rear (downpipe) correct? Does anyone know the one for the manifold? The front one?
Bookmark this for future reference when P/N hunting:

http://www.rockauto.com/catalog/raframecatalog.php

Amazon has the OE upstream sensor for $105:

Amazon.com: Denso 234-9011 Oxygen Sensor (Air and Fuel Ratio Sensor): AutomotiveAmazon.com: Denso 234-9011 Oxygen Sensor (Air and Fuel Ratio Sensor): Automotive
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Old 10-31-2011, 10:05 AM   #12
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As Spenk has said, skip the bosch. It will only give your ecu false readings under wot. (leaner)
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Old 10-31-2011, 11:00 AM   #13
Strider327
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Quote:
Originally Posted by Subian View Post
As Spenk has said, skip the bosch. It will only give your ecu false readings under wot. (leaner)
I already ordered the Denso one. Just wanted to know which one I was buying (rear or front). I'll be replacing both of them, since I've never done so. Thanks guys.
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