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PACCAR MX (2004 Emissions) Fault Code: P2239 Lambda – Current Too High on ECU (D420) Pin (C45)

Description

PACCAR MX (2004 Emissions) Fault Code: P2239 Lambda – Current Too High on ECU (D420) Pin (C45)

SET CONDITIONS:
The PCI ECU (D420) detects a higher current than expected in the measuring circuit of the lambda sensor.

DIAGNOSTIC CONDITION:
The diagnostic runs continuously when the ignition is keyed on.

RESET CONDITION:
The DTC changes to inactive after the diagnostic runs and passes

POSSIBLE CAUSES:
1. Lambda sensor wiring issue
2. Lambda sensor failure

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