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Old 01-18-2011, 10:06 AM   #1
2005rs
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Member#: 126753
Join Date: Sep 2006
Chapter/Region: NESIC
Vehicle:
2005 2.5 RS
black

Default CEL on my 05 rs

I have a cel light on my 2005 Rs
the codes are
p0031 HO2s heater control circuit low bank 1 sensor 1
p0131 02 sensor low voltage sensor 1 bank one
p0037 HO2s heater control circuit low bank1 sensor 2
p0134 02 sensor no activity bank one sensor one

I have already replaced the front A/f ratio sensor. were is the next place i should look for a solution
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Old 01-18-2011, 07:52 PM   #2
yarrgh
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Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

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Look in the wiring going to the oxygen sensor. All of it. Check all connections, all grounds, did you reset the ECU after replacement?
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Old 03-29-2012, 09:32 PM   #3
bobjr94
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Member#: 6176
Join Date: Apr 2001
Chapter/Region: NWIC
Location: Roy,WA
Vehicle:
15 WRX, 04 wrb STi
85 wrb BRAT

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I see this is over a year old now, but did you find the problem ? Working on a 05RS also, had the P0031 & P0134 codes. Checked the old sensor with a muiltimeter and the heater was dead. It should be around 10 ohms it said, this one was open.

Put on new O2 sensor, cleared the codes, it got rid of the heater code but still gets P0134 after a minute or 2 of driving. Testing the sensor shows it's outputting voltage when the car is running, but the computer is not seeing it. On the scope, the computer says the O2 sensor is flat at .02 volts.

The strange thing is the computer is putting back out about .350 volts on the sensor wires if you unplug the sensor and probe the car side of the plug and then 14 volts on the 2 heater wires, but that part is ok.

Im thinking the ecu may have failed to put putting out power on the sensor inputs ? Anyone else have to change a computer for this reason ?
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Old 04-10-2012, 12:26 PM   #4
Colando Dunes
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Member#: 262977
Join Date: Nov 2010
Location: buffaloscooby
Vehicle:
2002 2.5 RS
silver surfer

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Currently have a p0131 (low o2 circuit voltage) on an 05 rs. Just changed the o2 sensor for a denso, now code only comes back after harder acceleration (does this have to do with open vs closed circuit conditions? Still reading up on all of that).
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Old 12-03-2012, 08:47 PM   #5
BlobEyeRS
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Member#: 336270
Join Date: Oct 2012
Chapter/Region: MWSOC
Location: Cuyahoga Falls
Vehicle:
2005 Impreza
Black

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Just pulled similar codes from my 05 RS. I have a new o2 sensor to put in and going to replace the cat too just in case. Hoping it's not the ECU...

p0131
p0031
p0134
p0297
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Old 12-03-2012, 10:55 PM   #6
bobjr94
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Member#: 6176
Join Date: Apr 2001
Chapter/Region: NWIC
Location: Roy,WA
Vehicle:
15 WRX, 04 wrb STi
85 wrb BRAT

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As a follow up, it turned out the auto parts store sold me the wrong sensor, a narrow band sensor that only works for the rear. I got the correct one online and it fixed the problem.
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Old 01-14-2013, 11:31 PM   #7
BlobEyeRS
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Member#: 336270
Join Date: Oct 2012
Chapter/Region: MWSOC
Location: Cuyahoga Falls
Vehicle:
2005 Impreza
Black

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I think part of my problem is an exhaust leak at the header/cat flange which is also leading to the CEL issue.
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Old 05-03-2013, 02:47 AM   #8
JR Imperial
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Join Date: Jun 2009
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I know this is hella late but I'm getting P0031 and P0037 on my 05' RS. I replaced both the a/f sensor and the o2 sensor and disconnected the batter and tried to clear the code but CEL comes back on immediately after start up. I don't know what else to do. I know you can check resistance or something in the wires to see if the sensors are getting voltage, but I don't know which wires to check and what the voltage or resistance should be. FML.... If you guys got any suggestions for me it would be much appreciated!! Thanks!
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