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Home >> Subaru >> 2012 >> Legacy Limited >> Repair and Diagnosis >> Engine Performance >> System >> Engine Diagnostics (H4SO) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) >> DTC Detecting Condition
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DTC P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1): DTC Detecting Condition

CAUTION: After servicing or replacing faulty parts, perform Clear Memory Mode Refer to , OPERATION , Clear Memory Mode and Inspection Mode Refer to , PROCEDURE , Inspection Mode.
Step Check Yes No
1 CHECK EXHAUST SYSTEM. 
NOTE: Check the following items.
  • Loose installation of front portion of exhaust pipe onto cylinder heads
  • Loose connection between front exhaust pipe and front catalytic converter
  • Damage of exhaust pipe resulting in a hole
Is there any fault in exhaust system? Repair the exhaust system. Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR Front Oxygen (A/F) Sensor.