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.
2012 Subaru Outback LimitedFACTORY OEM SERVICE PROCEDURE
Drive Cycle A
| DTC | Item | Condition |
|---|---|---|
| *P0125 | Insufficient Coolant Temperature for Closed Loop Fuel Control | Engine coolant temperature at engine start is less than 20°C (68°F). |
| *P0126 | Insufficient Engine Coolant Temperature for Stable Operation | - |
| *P0128 | Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature) | - |
| *P0133 | O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) | - |
| *P0141 | O2 Sensor Heater Circuit (Bank1 Sensor2) | - |
| *P014C | O2 Sensor Slow Response - Rich to Lean (Bank 1 Sensor 1) | - |
| *P014D | O2 Sensor Slow Response - Lean to Rich (Bank 1 Sensor 1) | - |
| *P015A | O2 Sensor Delayed Response - Rich to Lean (Bank 1 Sensor 1) | - |
| *P015B | O2 Sensor Delayed Response - Lean to Rich (Bank 1 Sensor 1) | - |
| *P0171 | System Too Lean (Bank 1) | Complete diagnosis with drive cycle B or C as well. |
| *P0172 | System Too Rich (Bank 1) | Complete diagnosis with drive cycle B or C as well. |
| *P0196 | Engine Oil Temperature Sensor Circuit Range/Performance | - |
| *P0301 | Cylinder 1 Misfire Detected | Complete diagnosis with drive cycle B or C as well. |
| *P0302 | Cylinder 2 Misfire Detected | Complete diagnosis with drive cycle B or C as well. |
| *P0303 | Cylinder 3 Misfire Detected | Complete diagnosis with drive cycle B or C as well. |
| *P0304 | Cylinder 4 Misfire Detected | Complete diagnosis with drive cycle B or C as well. |
| *P0420 | Catalyst System Efficiency Below Threshold (Bank 1) | - |
| *P0442 | Evaporative Emission Control System Leak Detected (Small Leak) | Engine coolant temperature at engine start is less than 30°C (86°F). |
| *P0451 | Evaporative Emission Control System Pressure Sensor | - |
| *P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) | Engine coolant temperature at engine start is less than 30°C (86°F). |
| *P0457 | Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off) | Engine coolant temperature at engine start is less than 30°C (86°F). |
| *P0459 | Evaporative Emission System Purge Control Valve Circuit High | - |
| P1443 | Vent Control Solenoid Valve Function Problem | - |
| *P2096 | Post Catalyst Fuel Trim System Too Lean (Bank 1) | Complete diagnosis with drive cycle B or C as well. |
| *P2097 | Post Catalyst Fuel Trim System Too Rich (Bank 1) | Complete diagnosis with drive cycle B or C as well. |
Diagnostic procedure:
- Drive for 20 minutes or more at a constant speed of 80 km/h (50 MPH) or more.
- Stop the vehicle and idle for one minute.
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.
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