PACCAR MX (2004 Emissions) Fault Code: P2238 Lambda – Current Too Low on ECU (D420) Pin (C45)
SET CONDITIONS:
The PCI ECU (D420) detects a lower 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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