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.
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HOMESERVICE MANUALSSUBARU2014LEGACY 2.5I, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 50 (ENGINE CONTROL SYSTEM (DIAGNOSTICS) (H4DOTC))DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P1134: A/F SENSOR MICRO-COMPUTER PROBLEMDTC DETECTING CONDITION
2014 Subaru Legacy 2.5i, Automatic CVT Trans
DTC P1134: A/F Sensor Micro-Computer Problem: DTC Detecting Condition
2014 Subaru Legacy 2.5i, Automatic CVT TransSECTION DTC Detecting Condition
WARNING: This page is about a different car, the 2014 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
- Immediately at fault recognition
- GENERAL DESCRIPTION < Ref. to DTC P1134: A/F SENSOR MICRO-COMPUTER PROBLEM , Diagnostic Trouble Code (DTC) Detecting Criteria. >
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode < Ref. to
OPERATION , Clear Memory Mode. >, and Inspection Mode < Ref. to
PROCEDURE , Inspection Mode. >.
DTC PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FOR ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". < Ref. to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > | Replace the ECM. < Ref. to ENGINE CONTROL MODULE (ECM) . > |
RENDER: 1.0x
NO RELATED
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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.