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Old 10-28-2012, 12:35 PM   #1
Dougbugeye
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Member#: 169781
Join Date: Jan 2008
Chapter/Region: Tri-State
Location: Syracuse NY
Vehicle:
2003 Impreza 2.5RS
Midnight black pearl

Default P0032 cel symptoms

Hi All,

MY 2003 RS has this: P0032 Front oxygen (A/F) sensor heater circuit high input.

This is what is happening the last few days: Try to start car, engine won't fire. Second attempt, engine fires. After about a half-minute at idle the rpms drop slightly and CEL comes on. I clear cel with scan gauge and cel stays off afterward. The exhaust smells a bit rich although appears to run fine without any abrupt power loss or bogging. The scan gauge shows open loop all the time from startup.
I noticed some oil consumption prior to CEL issue but fuel consumption appears about the same. I'm doing mostly city driving /short runs lately.

From searches it seems the O2 sensor is a likely culprit, but before I toss money at one, has anyone experienced anything else that would cause this issue? Could too much engine oil (i.e. overfilling), or a stuck PCV, for example, be a contributor?

Thanks for any help in this diagnosis. I was just ready to do spend some $$ on suspension mods and this comes up!
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Old 10-28-2012, 04:31 PM   #2
Dougbugeye
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Join Date: Jan 2008
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Vehicle:
2003 Impreza 2.5RS
Midnight black pearl

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addendum: Original OEM cats and 02 sensors. 51K miles on the odometer.
Borla coated UEL header on about 1 year, Ganz-style intake on about 1 1/2 years.
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Old 10-30-2012, 03:42 PM   #3
Dougbugeye
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2003 Impreza 2.5RS
Midnight black pearl

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bump!! I have a NYS inspection due in Nov. and I need to fix this.

Thanks for any and all helpful suggestions!
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Old 10-30-2012, 08:07 PM   #4
GrundleJuice
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2007 No YELLING
on the bus!

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A suck pcv valve or any other reason that oil would be going through the exhaust could shorten the life of or destroy am O2 sensor. But the heater circuit high data trouble code makes me think its not related to contamination but just age/mileage or a wiring issue.
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Old 10-30-2012, 09:45 PM   #5
Dougbugeye
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2003 Impreza 2.5RS
Midnight black pearl

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Quote:
Originally Posted by RaceFaceXC View Post
A suck pcv valve or any other reason that oil would be going through the exhaust could shorten the life of or destroy am O2 sensor. But the heater circuit high data trouble code makes me think its not related to contamination but just age/mileage or a wiring issue.
Thanks for the input! So age/mileage is in reference to the upstream O2 sensor itself, so replacing it may solve the heater circuit high code? (The sensor's wires look okay.)

The car runs well AFAIK, except right at startup when it chokes on the first crankover then catches on the next one, followed by the CEL.
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