Question about 2005 Subaru Outback

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I pulled the CEL code P0031 from my 05 Outback. Changed the front O2 sensor and reconnected everything. Cleared the code with the OBD2 reader. Upon startup CEL put out another P0031. Does the computer need to reset over a few days? Car is totally stock no exhaust mods and only 28500mi. Any advice?

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  • CarpeD Dec 11, 2009

    Is there a voltage or impedance that can be measured at the O2 sensor connection to the harness? I would like to track only 1 wire instead of all 4. Any suggestions where to start would be great.

    thx

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  • Subaru Master
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This is a hard fault, this means u have a wiring problem, the sensor was good, that is why the PCM set a code for the same fault right away.

Posted on Dec 11, 2009

Testimonial: "Thanks for the quick info."

  • Marvin
    Marvin Dec 11, 2009

    yes u check the voltage which should be constantly varying between about .25 and .55 volts, u need a scanner with live data capability to do these tests, u can buy these on Ebay for around $80

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