O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1
P2247 indicates a reference voltage circuit issue with the O2 sensor, typically caused by electrical problems or sensor malfunction. This affects fuel mixture calculation and engine performance.
What You Might Notice
- Reduced fuel efficiency
- Diminished engine performance
- Service engine soon light illuminated
- Stored misfire or lean/rich codes
- Rough idle or hesitation
Most Common Causes
- 1
Blown O2 sensor fuse
Electrical protection device failure prevents proper voltage supply to the sensor.
- 2
Faulty O2 sensor
Defective sensor fails to generate proper reference voltage signals.
- 3
Wiring or connector issues
Corroded, damaged, or loose electrical connections disrupt voltage transmission.
- 4
PCM malfunction
Engine control module failure prevents proper sensor signal processing.
How to Diagnose It
- 1
Check Blown O2 sensor fuse — Electrical protection device failure prevents proper voltage supply to the sensor.
- 2
Check Faulty O2 sensor — Defective sensor fails to generate proper reference voltage signals.
- 3
Check Wiring or connector issues — Corroded, damaged, or loose electrical connections disrupt voltage transmission.
- 4
Check PCM malfunction — Engine control module failure prevents proper sensor signal processing.
How to Fix It
- 1
Replace blown fuse
Inspect fuse box and replace the O2 sensor circuit fuse with correct amperage.
- 2
- 3
Repair wiring/connectors
Clean, repair, or replace damaged harness connections and wiring.
- 4
Diagnose PCM
Perform advanced diagnostics to determine if engine control module requires programming or replacement.
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