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 MANUALSLINCOLN2009NAVIGATOR L RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEFUEL DELIVERYFUEL SYSTEM - GENERAL INFORMATIONDIAGNOSIS AND TESTINGFUEL SYSTEMDTC CHART
2009 Lincoln Navigator L RWD
DTC Chart
2009 Lincoln Navigator L RWDSECTION DTC Chart
EVAPORATIVE EMISSION (EVAP) SYSTEM DTC CHART
| DTC | Description | Action |
|---|---|---|
| P0446 | Evaporative Emission System Vent Control Circuit | Go To PINPOINT TEST A . |
| P0451 | Evaporative Emission System Pressure Sensor/Switch Range/Performance | Go To PINPOINT TEST A . |
| P0452 | Evaporative Emission System Pressure Sensor/Switch Low | Go To PINPOINT TEST A . |
| P0453 | Evaporative Emission System Pressure Sensor/Switch High | Go To PINPOINT TEST A . |
| P0454 | Evaporative Emission System Pressure Sensor/Switch | Intermittent Go To PINPOINT TEST A . |
| P1450 | Unable to Bleed up Fuel Tank Vacuum | Go To PINPOINT TEST A . |
| P1451 | Evaporative Emission System Vent Control Circuit | Go To PINPOINT TEST A . |
| P260F | Emission System Monitoring Processor Performance | Go To PINPOINT TEST A . |
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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.