P2248 Hyundai Code - O2 Sensor Reference Voltage Performance Bank 2 Sensor 1

P2248 indicates an issue with the O2 sensor reference voltage performance on Bank 2 Sensor 1, meaning the sensor is reporting a voltage outside the expected range.

Common symptoms include poor fuel economy, rough idling, hesitation during acceleration, a lit check engine light, and increased emissions.

Possible causes include a faulty Bank 2 Sensor 1 oxygen sensor, damaged wiring or connectors, a malfunctioning engine control module (ECM), or an exhaust leak near the sensor.

Start by inspecting the O2 sensor wiring and connectors for damage or corrosion, check for exhaust leaks, and use a multimeter to test the reference voltage at the sensor.

While the car may still be drivable, driving with this code can lead to poor performance, reduced fuel efficiency, and potential damage to the catalytic converter over time.

Repairs may include replacing the faulty O2 sensor, repairing damaged wiring or connectors, addressing exhaust leaks, or updating/reprogramming the ECM.

The repair cost varies but typically includes $100–$300 for a new O2 sensor plus labor, depending on your location and vehicle model.

Tools may include an OBDII scanner, multimeter, basic hand tools for removing the O2 sensor, and possibly a smoke machine to detect exhaust leaks.

Bank 2 Sensor 1 is a pre-catalytic converter oxygen sensor that monitors the air-fuel ratio for one side of the engine to ensure optimal combustion.

While rare, a clogged or failing catalytic converter can disrupt O2 sensor readings, potentially triggering the P2248 code. Inspect other components first.