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Old 04-15-2009, 12:56 PM   #1
NT Imp 25
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Member#: 181285
Join Date: May 2008
Chapter/Region: Tri-State
Location: Lancaster, Pa
Vehicle:
2005 Impreza RS
Silver Metallic

Default CEL Diagnosis

Hey everyone, I was hoping some of you might be able to point me in the right direction. The CEL came on along with a blinking cruise light about a week ago on my MY 2005 impreza RS. I had the codes pulled and they read:

P0031 Front oxygen (A/F) sensor heater circuit low input
P0037 Rear oxygen sensor heater circuit malfunction.

Any suggestion on where to start? Wiring maybe? Are they in series?
Thanks for any help you can provide.
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Old 04-15-2009, 03:03 PM   #2
yarrgh
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Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

you can always clean up all your grounds to see if it helps.
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Old 04-15-2009, 03:30 PM   #3
formula91
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Join Date: Dec 2005
Chapter/Region: MWSOC
Location: Northbrook, IL
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2005 2.5RS 4EAT
Platinum Silver

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I would try and check the wiring all the way to the ECU plugs, and then if there is no problem there, clean the grounds.
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Old 04-15-2009, 03:36 PM   #4
NT Imp 25
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Silver Metallic

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Ok, thanks i'll start with that this weekend. The car was sitting for awhile... almost 3 months. Would this cause anything the CEL? Corrosion on the O2 sensor(s)?
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Old 04-15-2009, 03:50 PM   #5
formula91
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Location: Northbrook, IL
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2005 2.5RS 4EAT
Platinum Silver

Default

I bet it's possible but unlikely. (The Rusting) That only really happens if the O2 sensor is in the exhaust from a 6 o'clock position in which condensation can collect in the sensor.

Maybe some rats or something chewed on the wiring?
I've had stranger stories relating to car storage and rodents. lol.

The car sitting around could cause problems for various reasons. I'm just not sure how.
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Old 04-15-2009, 11:32 PM   #6
NT Imp 25
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Silver Metallic

Default

Any other suggestions? I'd like to get a bunch of possibilities together to try and solve this in one weekend.

Thanks again.
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Old 05-11-2009, 10:31 PM   #7
Sideshowbob
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97 TJ, 04 Matrix
XR70R, 03 Gas Gas 250

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I am also throwing P0037... curious to see a solution.
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Old 05-12-2009, 12:11 AM   #8
williaty
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Location: Delaware County, Ohio
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2005 2.5RS Wagon
Regal Blue Pearl

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I'm going to guess either your front or rear O2 sensor has died and the ECU can't decide which one it is and is therefore complaining about both.

I've seen a couple of 05s already go through 2-4 front O2s, so I'd start there.
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