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Old 12-05-2012, 06:00 PM   #19
hunteragp
Scooby Newbie
 
Member#: 266880
Join Date: Dec 2010
Chapter/Region: MWSOC
Location: Minot, ND
Vehicle:
2004 WRX STi
WRB on gold

Default

Yup, it looks like its the front 02 sensor. When mine went bad the AP would read very lean while my wide band would go rich (very). It's a terrible idea to go WOT with a problem like that. When the O2 sensor is reading lean the ECU compensates with more fuel. I was seeing 25% AF Correction! Cruising AFRs were on the10's! Change that sensor and install the new one carefully this time then reset the ECU.
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