The P2248: O2 Sensor Reference Voltage Performance Bank 2 Sensor 1 code refers to a performance problem in the reference voltage circuit of the oxygen (O2) sensor for Bank 2 Sensor 1. This issue may arise due to improper voltage levels or fluctuations, potentially caused by calibration problems, wiring issues, or connector faults. Such performance issues can prevent the O2 sensor from accurately monitoring the oxygen levels in the exhaust gases, which affects engine efficiency and emissions control.
P2248 – Quick Overview
Code | Information |
---|---|
Meaning | P2248: O2 Sensor Reference Voltage Performance Bank 2 Sensor 1 |
Is it serious? | Yes, as performance issues in the reference voltage can lead to incorrect air-fuel mixture control, affecting fuel efficiency and increasing emissions. |
Possible causes | – Performance issues with O2 sensor reference voltage for Bank 2 Sensor 1 – Calibration problems – Wiring or connector issues |
How to diagnose? | – Test the performance of the O2 sensor reference voltage for Bank 2 Sensor 1 – Check for calibration issues – Inspect wiring and connectors for faults |
P2248 Meaning
The P2248: O2 Sensor Reference Voltage Performance Bank 2 Sensor 1 code indicates that there is an issue with the reference voltage provided to the O2 sensor in Bank 2 Sensor 1, resulting in a performance problem. This voltage is essential for the sensor to function correctly. If it is unstable, too high, or too low, it can prevent the sensor from providing accurate oxygen level readings. This, in turn, affects the ECU’s ability to correctly adjust the air-fuel mixture, leading to reduced efficiency and increased emissions.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to check if there are any other related codes present. Additional codes could provide context on whether this issue is isolated or related to a broader problem. | OBD-II Scanner |
Test the Performance of the O2 Sensor Reference Voltage | Use a multimeter to measure the reference voltage of Bank 2 Sensor 1. Compare the voltage levels with the manufacturer’s specifications to ensure they are within the acceptable range. Look for any fluctuations that might indicate a performance issue. | Multimeter, Vehicle Service Manual |
Check for Calibration Issues | Use a diagnostic scanner to verify if the O2 sensor calibration is correct. Sometimes the sensor may require recalibration, especially if there have been recent software updates or repairs. Perform a recalibration if necessary to restore optimal sensor performance. | Diagnostic Scanner, Calibration Tool |
Inspect Wiring and Connectors for Faults | Visually inspect the wiring and connectors for Bank 2 Sensor 1. Look for broken wires, loose connections, corrosion, or any visible damage that might cause instability in the reference voltage. Repair or replace any faulty wiring or connectors as needed. | Flashlight, Safety Gloves |
Inspect Sensor Connector Condition | Examine the sensor connector for bent pins, poor contact, or signs of corrosion. Securely attach the connector to ensure proper contact, as poor connections can affect the performance of the reference voltage. | Flashlight |
Clear the Code and Test Drive | After completing the necessary repairs, use an OBD-II scanner to clear the P2248 code. Conduct a test drive to monitor the sensor’s performance and verify that the reference voltage levels are stable and the issue has been resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | After the test drive, re-scan the vehicle to ensure that the P2248 code has not returned. If the issue persists, further diagnostics will be required to identify underlying problems with the O2 sensor or circuit. | OBD-II Scanner |

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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)