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Old 05-17-2008, 03:33 AM   #1
rexman2002
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Member#: 140244
Join Date: Feb 2007
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
02 bugeye
"stare ale jare"

Default Threw a P0031 code

Threw the code today, P0031, the A/F sensor heater low circuit. It's an 02 WRX with 134k miles. Never replaced any sensors before. I tried resetting the ecu with the access port, but the code comes back on. Is it safe to drive the car before I get a new sensor?
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Old 05-17-2008, 06:17 AM   #2
mikeythejew
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07' wrx
Mothballed until winter

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I don't think it's safe to drive your car. Excess fuel can enter the exhaust system and force the cat into overtime. Fix the problem before the cat disintegrates.
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Old 05-17-2008, 08:36 AM   #3
rexman2002
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I forgot to add the car is stage 2, protuned. I have a catless uppipe, and downpipe. No cats. Also borla header in place of the stock exhaust manifold.
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Old 05-17-2008, 10:35 AM   #4
TedMeyer
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Location: Arizona
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2002 WRX sedan
Silver. Now w/ 100% 18G!

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Shouldn't be an issue. I've had this CEL for 2 weeks -- took a few days to figure out the issue, test it, and a few days to get the new sensor from Oxygensensors.com (very fast), which arrived on Tues and now I'm gonna walk down to the garage to install it. I believe the P0031, which is what I threw as well, is the heater circuit for the sensor so it would only have a effect at startup. I barely noticed any difference in driving my car, though I refrained from any stoplight racing.

I did check my CEL every day to make sure I wasn't throwing any new codes -- you'd get a "rich condition" CEL if it causes too big an issue.
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Old 05-17-2008, 04:11 PM   #5
www.rex
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Quote:
Originally Posted by TedMeyer View Post
and a few days to get the new sensor from Oxygensensors.com (very fast), which arrived on Tues and now I'm gonna walk down to the garage to install it.
I have to replace the front OS as well on my '02 WRX. Just got mine from oxygensensor.com. Agreed, very good service. Delivered in 5 days into Canada. I have read access is through the passenger side wheel well. There is a plastic panel to open or remove? Ted, can you give me a description of location, appearence, size of this access panel? Anything in particular to watch out for doing this install?
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Old 05-17-2008, 06:59 PM   #6
WRBLueGD2
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2004 WRX
Blue

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The fender liner mounts to the frame where you need to go. On the passenger side, take your tire off (It's easier) and you'll probably need a wrench as an O2 socket is very tight to get in there. You can take undo the front half of the fender liner and as you peel it back, you'll see you manifold and the wire sticking out. Very hard to miss. If you have a wrench instead of a socket and can get the car up enough, you can just take it out from underneath. When putting in your new one, be sure to guide the wires WITH the rotation of the O2 sensor so you don't ruin any wires.
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