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 MANUALSMITSUBISHI2001MIRAGE DE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SELF-DIAGNOSTICSDIAGNOSTIC TESTSDTC P0172: SYSTEM TOO RICHPROBABLE CAUSES
2001 Mitsubishi Mirage DE, Standard
Probable Causes
2001 Mitsubishi Mirage DE, StandardSECTION Probable Causes
- Manifold Absolute Pressure (MAP) sensor failed (1.5L).
- Volume Airflow (VAF) sensor failed (1.8L).
- Barometric Pressure (BARO) sensor failed (1.8L).
- Fuel injector failed.
- Incorrect fuel pressure.
- Intake air leaks.
- Heated Oxygen Sensor (HO2S) failed.
- Engine Coolant Temperature (ECT) sensor failed.
- Intake Air Temperature (IAT) sensor failed.
- Exhaust system leak.
- Use of incorrect fuel.
- Engine Control Module (ECM) failed.
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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.