cel o2 sensor code problems please help - Subaru WRX Forum
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post #1 of 2 Old 06-27-2012, 01:30 AM Thread Starter
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cel o2 sensor code problems please help

Ok i just recently purchased a 03 wrx and have the cel on. Now, the codes i am getting are p0130 and p0031. They told me that these codes indicate the front o2sensor. I immediately assumed it was bad so i bought the cheap universal bosch brand. I placed it on the car with the battery off and the dam cel is still on. (it went out for about 10 seconds than it came off. Now i again went to the store and told them this and they said i needed to run the car for about 0 to 500 miles. I went on a couple forums and they said as soon as you plug it in with the battery off it should remove the cel and not come back on. Can anyone please tell me what is wrong or what i need to do? i was going to take to subaru but i know they charge alot for any little problem. any type of help and comments will be greatly appreciated it. Thank You
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post #2 of 2 Old 06-27-2012, 05:52 AM
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pzr2874 is known to be trustworthy and helpful pzr2874 is known to be trustworthy and helpful
Well, are you getting BOTH codes after you replaced the sensor because it's not always just the sensor.

After a search I came up with this:

-Water or corrosion in the connector
-Loose terminals in the connector
-Wiring burnt on exhaust components
-Open or short in the wiring due to rubbing on engine components
-Holes in exhaust allowing unmetered oxygen into exhaust system
-Unmetered vacuum leak at the engine
-Bad o2 sensor
-Bad PCM

I'm going to go with a vac leak. Have you looked underneath from the downpipe back?

Are there any mods on the car?

2002 WRX Sold
2007 WRX Sold
2007 STi totaled
2007 Foz XT sold
2007 MS3
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