What Does P2247 Mean?
The oxygen sensor reference voltage circuit for Bank 2 Sensor 1 is open or disconnected. This affects the sensor's ability to provide accurate readings to the ECM for fuel trim adjustments.
Common Causes
35%
Broken or corroded wiring in the O2 sensor reference voltage circuit
30%
Failed oxygen sensor internal reference circuit
20%
Damaged or corroded connector at O2 sensor or ECM
10%
ECM internal reference voltage circuit failure
5%
Shorted or damaged harness from exhaust heat exposure
Diagnostic Steps
1
Step 1: Visually inspect Bank 2 Sensor 1 O2 sensor connector and wiring for damage, corrosion, or loose connections
2
Step 2: Measure reference voltage at O2 sensor connector using a digital multimeter (should be approximately 0.4-0.5V with key on, engine off)
3
Step 3: Check continuity of reference voltage wire from O2 sensor connector back to ECM
4
Step 4: If wiring and voltage are good, monitor O2 sensor operation with scan tool while wiggling harness to detect intermittent opens
5
Step 5: Replace O2 sensor if wiring checks good but reference voltage is still absent or unstable
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The oxygen sensor reference voltage circuit for Bank 2 Sensor 1 is open or disconnected. This affects the sensor's ability to provide accurate readings to the ECM for fuel trim adjustments.
The most common cause of P2247 (O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1) is: Broken or corroded wiring in the O2 sensor reference voltage circuit
Typical repair costs for P2247 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive short distances but fuel economy will suffer and emissions will increase. Prolonged driving may damage catalytic converter.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2247 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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