O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1
Generic · emissions
Data confidence85%
The control module detected an interruption (open circuit) in the O2 Sensor Reference Voltage circuit, so the expected electrical continuity was not present.
Symptoms
MIL illuminated
Possible increased fuel consumption
Possible unstable idle
Possible causes
Wiring
H025 / Wiring
H025
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
O2 Sensor Reference Voltage Circuit/Open (Bank 1, Sensor 1)
Ford · emissions
Data confidence94%
Ford documents P2243:13 (circuit open) for its 2024-2025 gasoline-engine OBD monitor strategy as o2 sensor reference voltage circuit/open (bank 1, sensor 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
Inspect relevant wiring and connectors
Check power supplies and grounds
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.
2
Generic SAE-standard code: same meaning on every make.
243
Specific fault index within the subsystem.
Frequently asked questions about P2243
What does P2243 mean?
O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. The control module detected an interruption (open circuit) in the O2 Sensor Reference Voltage circuit, so the expected electrical continuity was not present.
Is P2243 generic or manufacturer-specific?
P2243 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 P2243 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
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Ford