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Old 03-06-2009, 10:01 PM   #4
MasterKwan
Scooby Guru
Member Sales Rating: (14)
 
Member#: 98961
Join Date: Oct 2005
Chapter/Region: MAIC
Location: NOVA
Vehicle:
2003 WRX
Black

Default

Subaru has no choice. If you want to blame someone, blame the EPA. The stock 02 sensor (assuming it's the same as the 02-07 which it might not be) only measures down to 11-11.3 so, you're probably alot richer than that. On my 03, the fuel map calls for 9-10ish under high load/high boost.

How many wires go into the primary 02 sensor? If it's more than 4 then it's probably a real wideband and not the faux wideband all the older suby's use.
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