O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1
P2243 — O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. It is a medium-severity fault: you can usually keep driving for short distances. The most common cause is damaged wiring, corrosion or a loose connector in the circuit.
"Not urgent today, but it won't fix itself either."
P2243 is a powertrain diagnostic trouble code. It identifies a fault related to O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. The powertrain control module monitors this circuit or component continuously and sets P2243 when the signal or value is outside the expected range, implausible or missing. This can affect engine performance, fuel economy or emissions and usually turns on the check-engine light. The base function may still work, but performance can be affected, so the fault should be diagnosed. Diagnosis generally means inspecting the related wiring, connectors and power/ground references, then verifying the component against specification with a scan tool.
- Check-engine light illuminated
- Possible rough running, reduced power or higher fuel consumption
- Fault code stored in the control module
| # | Cause |
|---|---|
| 01 | Damaged wiring, corrosion or a loose connector in the circuit |
| 02 | Faulty sensor, actuator or component referenced by the code |
| 03 | Open, short or high resistance in the circuit |
| 04 | Poor power supply or ground reference to the component |
| 05 | Failed control module |
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Coming soonDealership car, motorbike, scootervehicles for saleNo technical service bulletins or recalls currently reference P2243. This section updates automatically when manufacturers publish related bulletins.
A Honda Accord owner reported to NHTSA: “Scanned for codes. Found P0303, P0299, and P2243 stored. Found coolant entering cylinder 3. Found excessive play in the waste gate rod and found A/F sensor is not responding. Needs head gasket. Vehicle starts up and runs rough. All alerts…”
YES, WITH CAUTION — get it diagnosed as soon as possible.