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Old 09-08-2012, 06:56 PM   #26
HippieeSOOBIE
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this problem that you corrected here was causing acceleration hesitation? because i have that problem but dont know if i should be spending the money on a new sensor
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Old 09-08-2012, 07:04 PM   #27
turd_ferguson
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I don't recall having any hesitation issues. Overall, it felt about the same, the CEL just annoyed me.
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Old 09-08-2012, 08:43 PM   #28
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Quote:
Originally Posted by HippieeSOOBIE View Post
this problem that you corrected here was causing acceleration hesitation? because i have that problem but dont know if i should be spending the money on a new sensor
if your front o2 sensor is more than 100k miles old...replace it and be done

my car is at ~95k and im gonna just ****can it and get another one when i do the 100k service
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Old 03-26-2013, 05:31 PM   #29
doubledribble
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replaced my front 02 sensor with an OEM bosch one. CEL cleared after a trip around the block. Less than a tank of gas later it is back on. Haven't pulled the code yet but I'm going to assume it is the same.
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Old 05-21-2013, 04:47 AM   #30
Tesh
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Been doing all the research I and I have the same recurring code issue, P0031 heater control circuit bank 1 sensor 1, the oe sensor was measuring infinite resistance across the black heater wires so I picked up a bosch universal 4 wire sensor and wired it up today - cleared the code with Torque/BT OBD reader and no dice. I checked the relay under the dash (Brown relay is clicking) and also checked the plug in the bay (black wire heater circuit was showing 12v, the ground wire seemed grounding and don't know what I can do to check the signal wire).

The new sensor is showing 5.5ohm across the twin whir wires it uses for the heater so I don't see a problem there. .. any other suggestions?
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Old 05-21-2013, 05:58 AM   #31
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Quote:
Originally Posted by doubledribble View Post
replaced my front 02 sensor with an OEM bosch one. CEL cleared after a trip around the block. Less than a tank of gas later it is back on. Haven't pulled the code yet but I'm going to assume it is the same.
oem is denso...NOT botch
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Old 05-21-2013, 06:21 AM   #32
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Quote:
Originally Posted by Tesh View Post
Been doing all the research I and I have the same recurring code issue, P0031 heater control circuit bank 1 sensor 1, the oe sensor was measuring infinite resistance across the black heater wires so I picked up a bosch universal 4 wire sensor and wired it up today - cleared the code with Torque/BT OBD reader and no dice. I checked the relay under the dash (Brown relay is clicking) and also checked the plug in the bay (black wire heater circuit was showing 12v, the ground wire seemed grounding and don't know what I can do to check the signal wire).

The new sensor is showing 5.5ohm across the twin whir wires it uses for the heater so I don't see a problem there. .. any other suggestions?
throw it away and get a denso oem replacement one

or you will chase you ass with both hands...and never find it

NEVER use any 'universal' sensor...they just dont ever work right

using anything but a denso oem replacement sensor is a crapshoot...and ya gonna roll lotsa 7's
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Old 07-16-2013, 08:44 PM   #33
Darth Sleader
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Hey All,

I need help with P0031. I have gone through six of these sensors in the 2 years I've had this car! I did the diagnostic and found no resistance between the black wires of the sensor- sensor's heater circuit is dead. But why? What kills them? I kill one every few months! Wiring issue? Please help me solve if you can!

2008 WRX
VF52 turbo
Perrin headers/uppipe/turbo back exhaust
Grimmspeed boost control solenoid
*it might be important to note that the sensor in question is mounted in the uppipe, not the header. In the header, it was level. Factory sensors are mounted at an angle to allow moisture runoff. My mechanic thought this may be my problem and we moved it so it could be mounted at the factory angle.

Thanks guys.

Jer
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Old 07-31-2013, 04:33 PM   #34
Darth Sleader
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One more detail- I'm reading no resistance at all in the heater circuit (same reading as when I touch the meter's probes together.). That means I have a bad o2 sensor, right?

Jer
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Old 07-31-2013, 04:39 PM   #35
turd_ferguson
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No resistance means a bad sensor (or at least the heater circuit in the sensor). I wish I knew what to tell you about why you're going through sensors so quickly, but I have no idea. Maybe changing the angle like you recently did will help in the future.
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Old 07-31-2013, 04:58 PM   #36
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Quote:
Originally Posted by Darth Sleader View Post
One more detail- I'm reading no resistance at all in the heater circuit (same reading as when I touch the meter's probes together.). That means I have a bad o2 sensor, right?

Jer
Did it give a code?

What scale is your meter set to? Is it low enough to measure 2-5 ohms?
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Old 07-31-2013, 05:46 PM   #37
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Quote:
Originally Posted by rick-l View Post
Did it give a code?

What scale is your meter set to? Is it low enough to measure 2-5 ohms?
Yes, it's throwing the P0031 code (heater output low). My meter is the garden-variety cheapie, but the scale on the needle starts out very slow so you can read accurately under 10ohms, then gets steeper and jumps by 10s- so I should be able to read accurately any resistance under 10.

Thanks.
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Old 02-13-2014, 01:07 AM   #38
Panterag82
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I'm that guy reviving a dead thread!! Just got the P0031 code and my idle is now fluctuating when stopped. It goes from 1000 to 500 and keeps dropping until it almost stalls out.

My question is did anyone else experience these symptoms?? Before I grab a sensor I want to make sure it's not the sign of bigger issues.

My car is an 08 STI with 55k on it.
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Old 02-13-2014, 01:21 AM   #39
Charlesyang55
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Quote:
I'm that guy reviving a dead thread!! Just got the P0031 code and my idle is now fluctuating when stopped. It goes from 1000 to 500 and keeps dropping until it almost stalls out.
that sounds about right i was having the same symptoms. after you replace it it should be back to normal. when i took out my o2 sensor is was pretty much gone. I did notice i got better mpg after installing new sensor
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Old 02-13-2014, 02:17 AM   #40
rick-l
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I noticed no effects aside from the light being on.

P0031 just means the oxygen sensor heater is open and it takes longer for the sensor to heat up and go into closed loop control.
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Old 02-13-2014, 02:28 AM   #41
Panterag82
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Awesome. Thanks Charles, grabbing a new sensor now. Hoping this will make the code stay away.
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Old 10-07-2014, 07:29 PM   #42
Heanzley
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I have encountered the same code, I am trying to find denso 22641-AA090 in the US
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Old 06-22-2015, 10:43 PM   #43
ryderx
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Having a similar issue, different setup if anyone knowledgeable cares to chime in

http://forums.nasioc.com/forums/show...6#post43544056
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Old 06-28-2015, 05:24 PM   #44
kc-55vtsubie
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Default code 0031 bank 1

Bank 1 is the passenger side right?
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Old 01-09-2017, 11:51 AM   #45
Jesse002100
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Bringing it back alive... Thanks OP I'm starting a head gasket replacement and transfer swap on a new to me 03 wrx. I'm going to use this info to check everything first, but I assume I need a new sensor.
Thanks, Jesse
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Old 02-20-2018, 11:14 PM   #46
hart.auto527
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Default Bringing it back alive

I am having the same issue with my 2003 I will
Be doing the diagnostic procedure tomorrow but can anyone take a picture of the main relay that the o2 sensor harness goes to so I can find it and correct the issue also?
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