PACCAR MX (2004 Emissions) Fault Code: P0135 Lambda Sensor Heater – Current Too Low or Open Circuit on ECU (D420) Pin (C46)
PACCAR MX (2004 Emissions) Fault Code: P0135 Lambda Sensor Heater – Current Too Low or Open Circuit on ECU (D420) Pin (C46)
SET CONDITIONS:
The PCI ECU (D420) detects a lower current than expected on the control circuit of the lambda sensor heater.
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. Open circuit in the lambda sensor wiring
2. Lambda sensor failure
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