P2238Heated oxygen sensor (H028) 1, bank 1, positive current control - circuit low / - implausible signal
Generic (OBD-II) interpretation in the TuningBot DTC database.
P · PowertrainEmissionsOBD2
What P2238 means
P2238
Heated oxygen sensor (H028) 1, bank 1, positive current control - circuit low / - implausible signal
Generic · emissions
Data confidence78%
The control module detected that the signal in the Heated oxygen sensor (H028) 1, bank 1, positive current control circuit stayed below the expected operating range.
Symptoms
MIL illuminated
Possible increased fuel consumption
Possible unstable idle
Possible causes
Wiring short to ground
HO2S / Wiring
short to positive
short to ground
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
Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
238
Specific fault index within the subsystem.
Frequently asked questions about P2238
What does P2238 mean?
Heated oxygen sensor (H028) 1, bank 1, positive current control - circuit low / - implausible signal. The control module detected that the signal in the Heated oxygen sensor (H028) 1, bank 1, positive current control circuit stayed below the expected operating range.
Is P2238 generic or manufacturer-specific?
P2238 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P2238 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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