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.
2015 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
DTC P1134 A/F Sensor Micro-Computer Problem: DTC Detecting Condition
- 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.>.
DIAGNOSTIC 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) .> |
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.