DTC Detecting Condition:

WARNING: This page is about a different car, the 2004 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Two consecutive driving cycles with fault
GENERAL DESCRIPTION < Ref. to DTC P1152 -- O 2 SENSOR CIRCUIT RANGE/PERFORMCE (LOW) (BANK1 SENSOR1) , Diagnostic Trouble Code (DTC) Detecting Criteria.>
CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to OPERATION .> and Inspection Mode < Ref. to OPERATION .>.