What Does P2248 Mean?
The oxygen sensor reference voltage for Bank 2 Sensor 1 is performing outside expected parameters. The voltage signal is present but not within the acceptable range for proper operation.
Common Causes
35%
Degraded oxygen sensor with weak reference voltage signal
25%
High resistance in O2 sensor wiring or connectors
20%
Poor ground connection for O2 sensor circuit
15%
ECM reference voltage supply degradation or instability
5%
Contaminated oxygen sensor from coolant or oil consumption
Diagnostic Steps
1
Step 1: Monitor Bank 2 Sensor 1 reference voltage with scan tool in live data mode during various engine conditions
2
Step 2: Measure resistance of O2 sensor reference circuit from sensor to ECM (should be less than 5 ohms)
3
Step 3: Check all ground connections for O2 sensor circuit and clean/tighten as needed
4
Step 4: Verify ECM reference voltage supply is stable at 0.4-0.5V under all operating conditions
5
Step 5: Replace O2 sensor if all circuit measurements are within specification but performance issue persists
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The oxygen sensor reference voltage for Bank 2 Sensor 1 is performing outside expected parameters. The voltage signal is present but not within the acceptable range for proper operation.
The most common cause of P2248 (O2 Sensor Reference Voltage Performance Bank 2 Sensor 1) is: Degraded oxygen sensor with weak reference voltage signal
Typical repair costs for P2248 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced fuel economy and increased emissions. Extended operation 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 P2248 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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