John Deere Fault Code

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SPN 2659 FMI 18

Check Engine Light / Light Derate

System

Emissions

Symptom

Check Engine Light / Light Derate

Diagnosis & fix steps

LOGIC: EGR Mass Flow Rate Below Normal Operating Threshold. ACTION: Remove EGR valve and scrape out hard carbon crust holding pintle closed. Clean the exhaust gas recirculation delta-pressure sensing venturi pipe tubes.

Red Seal field insights

EGR Physics: Calculated exhaust gas recirculation gas volume drops underneath target emissions maps, increasing cylinder combustion temps.

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