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Old 07-16-2011, 07:17 PM   #2
Scooby Specialist
Member#: 198633
Join Date: Dec 2008
Chapter/Region: NESIC
Location: MA
2004 WRX


The a/f that the ap reads is largely useless. It is the front O2. Due to it's location, it is effectively a narrowband sensor. The ecu only pays attention to it in closed loop - actually provides usable readings in this case. You need a wideband O2 sensor (in the downpipe) if you want to read afr's properly.
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