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Old 12-04-2012, 09:11 AM   #9
Leafy
Scooby Specialist
 
Member#: 330625
Join Date: Aug 2012
Chapter/Region: NESIC
Location: MA
Vehicle:
2006 WRX
WRB

Default

P0171 + bad gas mileage and no power loss sounds a heck of a lot like an O2 sensor that has failed lean enough to max out the fuel trim, but not bad enough to throw a code for a failed O2 sensor. Or a vac leak, but normally that would be accompanied with a rough idle. If you had a wideband this would be easier to diagnose.

But follow flynlow's instructions for the leak test. Dont forget to check to turbo inlet tube under the intake manifold for leaking too.
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