P2243 KIA Code - O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1

Code P2243 indicates an issue with the O2 Sensor Reference Voltage Circuit/Open for Bank 1 Sensor 1, meaning the sensor isn’t receiving the correct reference voltage from the ECU.

Symptoms include poor fuel economy, rough idling, hesitation during acceleration, and an illuminated Check Engine Light.

Common causes include a damaged oxygen sensor, corroded wiring, a faulty ECU, or an open circuit in the reference voltage wiring.

The code refers to Bank 1 Sensor 1, which is the upstream oxygen sensor located before the catalytic converter on the engine's first bank.

While the car may still run, driving with this code can lead to poor performance, increased emissions, and potential damage to the catalytic converter if not addressed promptly.

Diagnosis involves using an OBDII scanner to confirm the code, visually inspecting the sensor and wiring, testing the reference voltage circuit, and checking for ECU faults.

Repairs may include replacing the oxygen sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the ECU if necessary.

Repair costs can range from $150 to $400, depending on whether the issue is a faulty sensor or a more complex problem with wiring or the ECU.

Yes, a malfunctioning oxygen sensor is a common cause of this code, as it may fail to properly communicate with the ECU.

Regular maintenance, such as inspecting and replacing oxygen sensors as needed and ensuring wiring integrity, can help prevent this code from reappearing.