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.
1995 Subaru Legacy Outback, AutomaticFACTORY OEM SERVICE PROCEDURE
Trouble Code Definition
OBD II DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION CHART
| DTC | SSM Title (1) | Circuit Affected | Probable Cause | ||
|---|---|---|---|---|---|
| P0100 | QA | Airflow Sensor Circuit | Open/Short Circuit | ||
| P0101 | QA-R | Airflow Sensor Circuit Range/Performance Problem | Bad Sensor | ||
| P0105 | P-S | Pressure Sensor Circuit Malfunction | Open/Short Circuit | ||
| P0106 | P-R | Pressure Sensor Range/ Performance | Bad Sensor | ||
| P0115 | TW | Coolant Temperature Sensor Circuit Malfunction | Open/Short Circuit | ||
| P0120 | THV | Throttle Position Sensor Circuit Malfunction | Open/Short Circuit | ||
| P0121 | TH-R | Throttle Position Sensor Range/Performance | Bad Sensor | ||
| P0125 | TW-CL | Coolant Temp Too Low For Closed Loop Control | Bad Sensor | ||
| P0130 | FO2-V | Front O2 Sensor Circuit Malfunction | Bad Sensor, Bad Fuel | ||
| P0133 | FO2-R | Front O2 Sensor Circuit Slow Response | Bad Sensor, Bad Fuel | ||
| P0135 | FO2H | Front O2 Sensor Heater Circuit Malfunction | Open/Short Circuit | ||
| P0136 | RO2-V | Rear O2 Sensor Circuit Malfunction | Bad Sensor, Bad Fuel | ||
| P0139 | RO2-R | Rear O2 Sensor Circuit Slow Response | Bad Sensor, Bad Fuel | ||
| P0141 | RO2H | Rear O2 Sensor Heater Circuit Malfunction | Open/Short Circuit | ||
| P0170 | FUEL | Fuel Trim Malfunction | Any Part Of Fuel System | ||
| P0201 | INJ1 | Fuel Injector No 1 | Inoperative Fuel Injector | ||
| P0202 | INJ2 | Fuel Injector No 2 | Inoperative Fuel Injector | ||
| P0203 | INJ3 | Fuel Injector No 3 | Inoperative Fuel Injector | ||
| P0204 | INJ4 | Fuel Injector No 4 | Inoperative Fuel Injector | ||
| P0301 | MIS-1 | Cylinder 1 Misfire Detected | Bad Igniter | ||
| P0302 | MIS-2 | Cylinder 2 Misfire Detected | Bad Igniter | ||
| P0303 | MIS-3 | Cylinder 3 Misfire Detected | Bad Igniter | ||
| P0304 | MIS-4 | Cylinder 4 Misfire Detected | Bad Igniter | ||
| P0325 | KNOCK | Knock Sensor Circuit Malfunction | Open/Short Circuit | ||
| P0335 | CRANK | Crankshaft Position Sensor | Open/Short Circuit, Bad Sensor | ||
| P0340 | CAM | Camshaft Position Sensor | Open/Short Circuit, Bad Sensor | ||
| P0400 | EGR | EGR Flow | Faulty EGR Sys. Function | ||
| P0403 | EGRSOL | EGR Circuit | EGR System Malfunction | ||
| P0420 | CAT | CAT Efficiency Below Threshold | Bad CAT, Bad Fuel Control | ||
| P0441 | CPC-F | Incorrect EVAP Purge Flow | Bad Purge Control Solenoid Valve | ||
| P0443 | CPC | EVAP Circuit Malfunction | Open/Short Circuit | ||
| P0500 | VSP | Vehicle Speed Sensor | Bad Sensor | ||
| P0505 | ISC | Idle Control System | Open/Short Circuit, Bad Idle Solenoid | ||
| P0506 | ISC-L | Idle RPM Too Low | Bad Idle Solenoid, Air By-Pass | ||
| P0507 | ISC-H | Idle Too High | Idle Solenoid, Air Leaks | ||
| P0600 | - | Serial Communication Link Malfunction | Open/Short Circuit | ||
| P0601 | RAM | Memory Check Error | ECM | ||
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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.