Poor Gas Miles

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Subaru Impreza 2008 Hatch Back



Oxygen sensor output voltage Bank 1 Sensor 1 ~ 0.760 volts



Oxygen Sensor Voltage Bank 1 Sensor 1 ~ 2.176 volts



Short Term fuel trim Bank 1 Sensor 2 = 0.0%



Equivalence ratio lambda Bank 1 Sensor 1 @600 rpm ~.999 @3000 rpm ~ 1.4





currently getting 14 MPG



could it be bad catalytic converter or oxygen sensor?
 
What scan tool are you using and what are the faults codes recorded in the PCM and TCM (if available).
What engine?
 
1) What are the fault codes that are either current or in history.
2) What transmission.
3) There are more than one version(s) of the Launch X431 Hand Held. Explain!
3) The basics?
A) Engine oil, tire pressures & condition, OEM or equivalent air filter, a basic tune up, PCV valve replacement
B) Cure any and all oil leaks
C) Free turning wheels and brake condition

Learn how to capture values and save for future use.

Subaru uses the SSM (Subaru Select Monitor) protocol.
OBD2 offers minimal but enough information for diagnosis.
 
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