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 MANUALSLINCOLN2006ZEPHYRREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID)DTC DIAGNOSISDTC P1408: EXHAUST GAS RECIRCULATION (EGR) FLOW OUT OF SELF-TEST RANGE (NON-MIL)
2006 Lincoln Zephyr
DTC P1408: Exhaust Gas RECIRCULATION (EGR) Flow Out Of Self-Test Range (Non-Mil)
2006 Lincoln ZephyrSECTION DTC P1408: Exhaust Gas RECIRCULATION (EGR) Flow Out Of Self-Test Range (Non-Mil)
P1408 - EXHAUST GAS RECIRCULATION (EGR) FLOW OUT OF SELF-TEST RANGE (NON-MIL)
| Description: | This test is carried out during the key on engine running (KOER) on-demand self-test only. The EGR system is commanded on at a fixed engine speed. The test does not pass and the DTC is set when the measured EGR flow falls above or below the required calibration. | ||
| Possible Causes: |
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| Diagnostic Aids: | For EEGR, use the output state control function of the diagnostic tool and monitor the manifold absolute pressure (MAP) PID and the EEGR PID (EGRMDSD) while commanding the EEGR on. If EGR is introduced into the engine at idle, the RPM will drop or stall out. For vacuum systems see diagnostic aids for P0401. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Vehicles With an Electric EGR (EEGR) | - | GO to Pinpoint Test KD . | - |
| Vehicles with an EGR system module (ESM) | - | GO to Pinpoint Test HH . | - |
| All others | - | GO to Pinpoint Test HE . | - |
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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.