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.
2021 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Read Current Data: List
| Items to be displayed | Unit of measure | Content | Note |
|---|---|---|---|
| IG on trip number | times | Time stamp information | - |
| IG on supply system | - | Time stamp information | - |
| past time after IG on | ms | Time stamp information | - |
| Fuel level resistance | Ω | Fuel sensor value display | - |
| Ambient air temperature | °C | External temperature sensor value display | - |
| Air temperature correction | °C | Correction value for displaying ambient temperature | - |
| Mean fuel efficiency correction | % | Correction value for displaying average fuel economy | - |
| Second level belt warning customize | 2-stage warning implemented/2-stage warning not implemented | Implementation status of seat belt second stage warning | - |
| External air temperature indication value | °C | Calculated value of external temperature for indication | - |
| Vehicle speed data | km/h | Vehicle speed value detected by meter | - |
| Engine speed data | RPM | Engine speed value detected by meter | - |
| Driver side seat belt state | Drivers seat seat-belt wearing state/Drivers seat seat-belt non-wearing state | Seat belt fastening status | - |
| Passenger side seat belt state | Passenger seat seat-belt wearing state/Passenger seat seat-belt non-wearing state | Seat belt fastening status | - |
| Rear side (right) seat belt state | Rear seat right seat-belt wearing state/Rear seat right seat-belt non-wearing state | Seat belt fastening status | - |
| Rear side (center) seat belt state | Rear seat center seat-belt wearing state/Rear seat center seat-belt non-wearing state | Seat belt fastening status | - |
| Rear side (left) seat belt state | Rear seat left seat-belt wearing state/Rear seat left seat-belt non-wearing state | Seat belt fastening status | - |
| EPS setting presence state | Electric power steering/No Electric power steering | Electric power steering equipment status | - |
| R.DIFF oil temperature sensing level | °C | Rear differential oil temperature sensor value | - |
| Outside temperature for diagnosis | °C | External temperature sensor value display | - |
| Demonstration mode permission/fault permission | Demonstration mode permission/fault permission | Demonstration mode permission status | - |
Factory Service Tools
Use the Manual With the Right Hardware
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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.