P0043Heated oxygen sensor (HO2S) 3, bank 1, heater control circuit low
Generic (OBD-II) interpretation in the TuningBot DTC database.
P · PowertrainEmissionsOBD2
What P0043 means
P0043
Heated oxygen sensor (HO2S) 3, bank 1, heater control circuit low
Generic · emissions
Data confidence90%
The control module detected that the signal in the Heated oxygen sensor (HO2S) 3, bank 1, heater control circuit stayed below the expected operating range.
Symptoms
MIL illuminated
Possible increased fuel consumption
Possible unstable idle
Possible causes
Wiring short to earth
1"1025
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
Powertrain: engine, transmission and driveline systems.
0
Generic SAE-standard code: same meaning on every make.
043
Specific fault index within the subsystem.
Frequently asked questions about P0043
What does P0043 mean?
Heated oxygen sensor (HO2S) 3, bank 1, heater control circuit low. The control module detected that the signal in the Heated oxygen sensor (HO2S) 3, bank 1, heater control circuit stayed below the expected operating range.
Is P0043 generic or manufacturer-specific?
P0043 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P0043 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.
ItalianoIT
DeutschDE
EspañolES
PortuguêsPT
FrançaisFR
РусскийRU