SPN 4765 FMI 4

WarningCooling

What This Code Means

Substitute value is taken for Oxi Cat temperature upstream sensor

Possible Causes

  • Defect in the electrical signal of the Oxi Cat temperature upstream sensor

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Get a diagnosis walkthrough for SPN 4765 FMI 4 on your specific Winco unit — cited to the OEM manual, not a forum guess.

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