P2248 Fault Code

O2 Sensor Reference Voltage Performance Bank 2 Sensor 1

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2248 fault code indicates a problem with the oxygen (O2) sensor reference voltage for Bank 2 Sensor 1. This sensor plays a crucial role in monitoring the oxygen levels in the exhaust gases, allowing the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion and emission control. When this code is triggered, it may lead to incorrect readings, which can affect engine performance and emissions.

What are the symptoms of the P2248 code?

Symptoms associated with the P2248 fault code may include:

• Reduced fuel efficiency due to improper air-fuel mixture adjustments.
• Engine hesitation or misfires during acceleration.
• Increased emissions leading to potential failure in emissions testing.
• Triggering of the check engine light, indicating an issue that needs attention.

What causes the P2248 code?

Common causes of the P2248 fault code include:

• Faulty oxygen sensor (Bank 2 Sensor 1) that cannot correctly measure the voltage.
• Wiring issues, such as shorts or open circuits in the sensor circuit.
• Poor electrical connections or corroded terminals in the sensor harness.
• Issues with the engine control module (ECM) that affect sensor readings.

How to fix P2248?

To resolve the P2248 fault code, consider the following steps:

• Visually inspect the wiring and connectors related to Bank 2 Sensor 1 for any signs of damage or corrosion.
• Test the oxygen sensor with a multimeter to ensure it is functioning correctly and replace it if necessary.
• Check the reference voltage supplied to the sensor and address any voltage discrepancies.
• Clear the fault code from the ECU and conduct a road test to determine if the code returns.