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Old 04-28-2007, 04:09 PM   #1
adamoliver
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Member#: 56057
Join Date: Feb 2004
Location: Stamford, CT
Vehicle:
2003 WRX
pearl blue

Question replacing front a/f sensor

so I got the CEL p0031 code a few weeks ago on my 2003 WRX. after checking the forum, i found the cause and ordered a new sensor. now i can't get the old one out of the freaking socket. How do you get a wrench around the sensor - do i have to take off the heat shield? That doesn't seem possible without removing a whole bunch of stuff. i sprayed a ton of WD40 on the thing and tried to twist it out with needle nose pliers - of course that didn't work. Does anyone have past experience with this job? Thanks.
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Old 04-28-2007, 04:15 PM   #2
anthonyrb98
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Join Date: Nov 2003
Chapter/Region: SCIC
Location: san diego
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02 bugeye
hbspeed tuned 18g sleeper

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yeah, the front a/f sensor is a pain. those of us who've done uppipe installs know. best way to get at it is front under the car. use a 7/8" open end wrench and you should be fine. i would use pb blaster vice wd40 as well.
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Old 04-28-2007, 05:24 PM   #3
hondaeater69
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it's also easier to unplug the sensor first, then unscrew, alleviates the twisting of the wires. works on install too.
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Old 04-28-2007, 06:16 PM   #4
adamoliver
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pearl blue

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thanks for the insight, guys. Looks like it's another trip to the hardware store!
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Old 04-28-2007, 06:50 PM   #5
WeldingHank
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Member#: 98645
Join Date: Oct 2005
Chapter/Region: NESIC
Location: Lawrence,ma
Vehicle:
2002 WRX Wagon
PSM

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7/8" flare nut wrench the THE best for removing stock WRX 02 sensors.
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