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P1408 LINCOLN

P1408 LINCOLN - EGR Flow Out Of Self-Test Range

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3   
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Possible causes

  • Faulty Exhaust Gas Recirculation (EGR) Valve
  • Exhaust Gas Recirculation (EGR) Valve Vacuum hose off or defective
  • Plugged Exhaust Gas Recirculation (EGR) Valve

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1408 Lincoln Description

The Exhaust Gas Recirculation (EGR) system recirculates a portion of the exhaust gasses into the intake manifold under average vehicle driving conditions to reduce combustion temperatures and exhaust gas NOx content. The amount of exhaust gas recirculated varies from zero with a cold engine to a fixed rate for a hot engine with intermediate load and low engine speed.

This test is performed 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 fails and the Diagnostic Trouble Code (DTC) is output when the measured EGR flow falls above or below the required calibration.

OBDII Code P1408 Lincoln - EGR Flow Out Of Self-Test Range - AutoCodes.com

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P1408 LINCOLN Comments

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