O2 Sensor Reference Voltage Performance Bank 2 Sensor 1

Where it lives

For P2248, start at the sensor the description names. The description of P2248 puts it on bank 2.

Check these first

• A bank 2 sensor 1 O2 reference voltage outside its expected range
• A contaminated bank 2 sensor 1 O2 reference cell
• High resistance in the bank 2 sensor 1 O2 reference wiring
• An exhaust leak skewing the bank 2 sensor 1 O2 reading

What to do next

1. Read bank 2 sensor 1 O2 reference voltage on a scan tool
2. Compare the reference voltage to the expected value
3. Test the bank 2 sensor 1 O2 reference wiring for added resistance
4. Check the bank 2 exhaust for leaks
5. Replace the bank 2 sensor 1 O2 sensor if the reference tests good
6. Clear the code and retest

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