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