Engine/Power - EJ20T (pre-2006 WRX and JDM) There is replacement for displacement, it is forced induction - OEM 2.0 liter turbo engines in the USDM WRX. 90-94 Legacy Turbo EJ22 turbo engines can also be discussed here.

cel p0031?

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Old Mar 5, 2004 | 05:38 AM
  #2  
Kevin M's Avatar
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Car Info: 1993/2000/2001 GF4 mostly red
P0031
Front oxygen (A/F) sensor heater circuit low input

It's the first code listed in the sticky in this forum. It means you have a 99% chance of needing a new Oxygen sensor. Otherwise, it could possibly be a wiring problem. Do you have aftermarket uppipe or downpipes?

Last edited by Kevin M; Mar 5, 2004 at 05:45 AM.
Old Mar 6, 2004 | 02:25 PM
  #4  
Kevin M's Avatar
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Have you put leaded race gas in the car? That will kill an O2 sensor quick. I'm almost positive that's what it is.
Old Mar 6, 2004 | 03:05 PM
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Kevin M's Avatar
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just random sensor failure I suppose.
Old Mar 17, 2004 | 12:08 AM
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Originally posted by timman_24
Can you buy one of these oxygen sensors on the internet? I don't have a dealer around.
subaruparts.com
Old Mar 17, 2004 | 09:07 AM
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Re: Re: cel p0031???????

Originally posted by jaypowell78
How do you get your CEL code?
You need an OBDII scan tool.
Old Mar 17, 2004 | 09:52 AM
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Re: oh yeah?

Originally posted by jaypowell78
wanna let me use yours?
No. But only because my scan tool is DeltaDash and I only have one license left.
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