P2AC3Intake Air O2 Sensor Reference Voltage Circuit/Open Bank 2
Generic (OBD-II) interpretation in the TuningBot DTC database.
P · PowertrainEmissionsOBD2
What P2AC3 means
P2AC3
Intake Air O2 Sensor Reference Voltage Circuit/Open Bank 2
Generic · emissions
Data confidence65%
The control module detected an interruption (open circuit) in the Intake Air 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
Aged or contaminated oxygen sensor
Sensor heater circuit fault
Wiring or connector fault
Exhaust leak near the sensor
Mixture fault upstream of the sensor
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.
AC3
Specific fault index within the subsystem.
Frequently asked questions about P2AC3
What does P2AC3 mean?
Intake Air O2 Sensor Reference Voltage Circuit/Open Bank 2. The control module detected an interruption (open circuit) in the Intake Air O2 Sensor Reference Voltage circuit, so the expected electrical continuity was not present.
Is P2AC3 generic or manufacturer-specific?
P2AC3 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P2AC3 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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