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 MANUALSFORD2018FUSION PLATINUM HYBRIDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - DIAGNOSTIC METHODS (HYBRID)ADAPTIVE FUEL DIAGNOSTIC TROUBLE CODE (DTCS) DIAGNOSTIC TECHNIQUESP0172 SYSTEM TOO RICH DIAGNOSTIC AIDS
2018 Ford Fusion Platinum Hybrid
P0172 System Too Rich Diagnostic Aids
2018 Ford Fusion Platinum HybridSECTION P0172 System Too Rich Diagnostic Aids
NOTE:
If the system is rich at certain conditions, then the LONGFT1 PID is negative value at that airflow, indicating that decreased fuel is needed.
System rich concerns are usually caused by fuel system concerns, although the MAF sensor, and base engine (for example, engine oil contaminated with fuel) should also be checked.
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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.