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 PERFORMANCESYSTEMENGINE CONTROLS - PINPOINT TEST DZ: UNIVERSAL HEATED OXYGEN SENSOR (HO2S) THROUGH PINPOINT TEST HG: POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM - (EXCEPT DIESEL & HYBRID)PINPOINT TEST HG: POSITIVE CRANKCASE VENTILATION (PCV) SYSTEMTEST PROCEDURE
2009 Lincoln Navigator L RWD
Test Procedure
2009 Lincoln Navigator L RWDSECTION Test Procedure
- HG1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Check for DTCs P053A, P145E or P1489.
Are any of the above listed DTCs present?
Yes No GO to HG5. For all other symptoms without DTCs, GO to HG2. - HG2 VISUAL INSPECTION OF THE PCV VALVE NOTE: If the PCV valve or tube is electrically heated, verify the electrical connection. On some applications the vehicle may be equipped with a thermal harness that only provides electrical continuity when the temperature is less than 5°C (40°F) +/- 4°C (+/- 7°F). Typically this harness is located close to the PCV valve or tube.
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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.