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Old 03-02-2017, 02:53 PM   #1
Ray-Ray03
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Default Unknown plug

Hey guys. A buddy of mine just picked up a 2005 WRX that had a CEL of P0031 heated O2 low voltage bank 1. He replaced the bank 1 O2 sensor and still has the CEL. We found this bad boy tucked away. Can anyone identify what it is to?
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Old 03-02-2017, 02:54 PM   #2
monkeyposeur
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That looks like the o2 sensor for the catted uppipe. If the uppipe is catless you have to tune the code out or install a resistor across the plug pins.
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Old 03-02-2017, 03:04 PM   #3
Ray-Ray03
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I took a look at the up pipe and it has a small wire that looks like a hear sensor going into a harness. But the up pipe does not look this there is a cat on it.
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Old 03-02-2017, 03:33 PM   #4
Ray-Ray03
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There is a EGT sensor but do not see a bung for an O2 sensor.
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Old 03-02-2017, 03:40 PM   #5
Ray-Ray03
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Btw, it is a two wire harness.
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Old 03-02-2017, 03:45 PM   #6
DatGriff
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Rear o2?
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Old 03-02-2017, 03:48 PM   #7
Ray-Ray03
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That is plugged in to its harness as well.
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Old 03-02-2017, 04:19 PM   #8
Ray-Ray03
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Maybe if someone can look in there engine bay and can get back to me on where it can be plugged into that'll be great. I have a 2012 and it is not similar.
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Old 03-02-2017, 04:29 PM   #9
monkeyposeur
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Quote:
Originally Posted by Ray-Ray03 View Post
There is a EGT sensor but do not see a bung for an O2 sensor.
Sorry, I meant EGT sensor not O2.
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Old 03-02-2017, 04:39 PM   #10
Charlie-III
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You have 2 O2's plugged in? On stock, there is one before the CAT (BxS1) and one after the CAT (BxS2).

If there is only 1 O2 sensor plugged in, that plug you showed is likely an O2 sensor plug, thus the CEL.
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Old 03-02-2017, 07:25 PM   #11
Ray-Ray03
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We replaced the one on the exhaust manifold and the one on the Cat is Bank 2.
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Old 03-02-2017, 08:23 PM   #12
Charlie-III
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Quote:
Originally Posted by Ray-Ray03 View Post
We replaced the one on the exhaust manifold and the one on the Cat is Bank 2.
So you have 2 O2 sensors plugged in? This is what I'm getting at.
If you only have one O2 plugged in, the mystery plug is likely for the missing O2 sensor.
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Old 03-02-2017, 08:26 PM   #13
Ray-Ray03
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Quote:
Originally Posted by Charlie-III View Post
So you have 2 O2 sensors plugged in? This is what I'm getting at.
If you only have one O2 plugged in, the mystery plug is likely for the missing O2 sensor.
Two O2 sensors are plugged in as well as the EGT sensor
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Old 03-02-2017, 11:11 PM   #14
Charlie-III
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Quote:
Originally Posted by Ray-Ray03 View Post
Two O2 sensors are plugged in as well as the EGT sensor
OK, thank you for clarifying, I have no clue for you then.
Good luck finding an answer, hope it works out.

Apologies if I came off as rude, was not my intention.
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Old 03-03-2017, 02:31 PM   #15
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No worries. Just figured it out that it is for his DRL. The car came with aftermarket headlights. Thanks for all the input.
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