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.
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HOMESERVICE MANUALSSUBARU2000FORESTER L, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TESTSDTC P0170: FUEL TRIM MALFUNCTION - EXCEPT 2.2L & LEGACY 2.5L M/T
2000 Subaru Forester L, Automatic
DTC P0170: Fuel Trim Malfunction - Except 2.2L & Legacy 2.5L M/T
2000 Subaru Forester L, AutomaticSECTION DTC P0170: Fuel Trim Malfunction - Except 2.2L & Legacy 2.5L M/T
- Check for the following problems in exhaust system:
- Looseness of installed components.
- Damage to parts (cracks, holes, etc.).
Replace or repair defective parts. If no defects are found, go to next step.
- Check for the following problems in air intake system:
- Looseness of installed components.
- Damage to parts (cracks, holes, etc.).
- Disconnection of hose on air intake system.
Replace or repair defective parts. If no defects, go to next step.
WARNING: Release fuel pressure before removing fuel lines.
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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.