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.
1991 Subaru XT AutomaticFACTORY OEM SERVICE PROCEDURE
Trouble Code Identification
TROUBLE CODE IDENTIFICATION
| Code | Circuit Affected | Probable Cause |
|---|---|---|
| 11 | Crank Angle Sensor | No Reference Signal |
| 12 | Starter Switch | Open/Short Circuit |
| 13 | Crank Angle Sensor | No Position Pulse |
| 14 | Fuel Injectors 1 & 2 (XT) | Abnormal Injector Output |
| 15 | Fuel Injectors 5 & 6 (XT6) | Abnormal Injector Output |
| 16 | Fuel Injectors 3 & 4 (XT) | Abnormal Injector Output |
| 17 | Fuel Injectors 1 & 2 (XT6) | Abnormal Injector Output |
| 21 | Coolant Temperature Sensor | Open/Short Circuit |
| 22 | Knock Sensor | Open/Short Circuit |
| 23 | Airflow Meter Circuit | Open/Short Circuit |
| 24 | Air Control Valve | Open/Short Circuit |
| 25 | Fuel Injectors 3 & 4 (XT6) | Abnormal Injector Output |
| 31 | Throttle Position Sensor | Open/Short Circuit |
| 32 | Oxygen (O2) Sensor | Abnormal Sensor Signal |
| 33 | Vehicle Speed Sensor | No Reference Signal |
| 35 | Purge Control Solenoid Valve | Open/Short Circuit |
| 41 | Fuel System | Fuel System Too Lean |
| 42 | Idle Switch | Abnormal Reference Signal |
| 51 | Neutral Switch | No Signal Present |
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.
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