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Old 07-03-2008, 03:09 PM   #1
Scooby Specialist
Member#: 132130
Join Date: Nov 2006
Chapter/Region: TXIC
Location: Austin, Texas
2002 Ford F-150
Graphite Gray

Default bank 1 o2 sensor under threshold - CEL

just last week or so my car keeps throwing a code for the front o2 sensor (bank 1) saying its below the threshhold or whatever..

im using an erz up pipe with the o2 sensor in it and a hks catless downpipe to oem wrx mid pipe to oem wrx axle back.

could it be a bad o2 sensor? part of me thinks it might be the car is running a little lean under 3K (td04 spoools quick ya know..) and thus possibly throwing the code?

keep in mind i have no piggybacks whatsoever installed anymore, and im using a blow-through maf. stock injectors.
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Last edited by mxpunk; 07-03-2008 at 03:31 PM. Reason: info
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Old 07-08-2008, 04:00 PM   #2
Scooby Specialist
Member#: 32503
Join Date: Feb 2003
Chapter/Region: TXIC
Location: Johnson City, TX
2011 Tribeca
1995 Legacy Wagon


My guess would be a bad O2 sensor - you could tell for sure by hooking up an OBD reader and monitoring the O2 sensor signal and see if the sensor is reacting properly.
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