HO2S Heater Control Circuit Bank 1 Sensor 3
Generic · emissions
Data confidence90%
The control module detected a fault associated with the HO2S Heater Control Circuit Bank 1 Sensor 3 circuit or function; the stored code identifies the affected component rather than a single failure mode.
Symptoms
MIL illuminated
Possible increased fuel consumption
Possible unstable idle
Possible causes
Wiring
HO2S
ECM
Recommended checks
Read live sensor voltage/current and heater status
Inspect wiring and connectors
Check for exhaust leaks near the sensor
Check fuel trim values for upstream mixture faults
HO2S Heater Resistance, Bank 1
Ford · emissions
Data confidence94%
Ford documents P0042:1E for its 2024-2025 gasoline-engine OBD monitor strategy as ho2s heater resistance, bank 1. This three-byte interpretation is application-specific and identifies the detected monitor condition rather than a confirmed failed component.
Recommended checks
Perform a full module scan
Review freeze-frame and occurrence data
Compare commanded and measured values
Check applicable OEM service information
Applies toFord gasoline-engine OBD applications|2024-2025 model years
Powertrain: engine, transmission and driveline systems.
0
Generic SAE-standard code: same meaning on every make.
042
Specific fault index within the subsystem.
Frequently asked questions about P0042
What does P0042 mean?
HO2S Heater Control Circuit Bank 1 Sensor 3. The control module detected a fault associated with the HO2S Heater Control Circuit Bank 1 Sensor 3 circuit or function; the stored code identifies the affected component rather than a single failure mode.
Is P0042 generic or manufacturer-specific?
P0042 exists both as a generic OBD-II code (same meaning on every make) and with 1 manufacturer-specific interpretation(s): Ford. Always read it in the context of your vehicle.
Can TuningBot remove P0042 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
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Ford