Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Subaru Outback Base, Automatic CVT TransFACTORY OEM SERVICE PROCEDURE
DTC P0133 O2 Sensor Circuit Slow Response (Bank 1 Sensor 1): DTC Detecting Condition
- Detected when two consecutive driving cycles with fault occur.
- GENERAL DESCRIPTION Refer to DTC P0133 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1) DTC P0133 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1), Diagnostic Trouble Code (DTC) Detecting Criteria.
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.
|
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. |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.