Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is having trouble with the oxygen sensor on one side of the engine. This sensor helps the car know how much fuel to use.
The P2248 code indicates that the reference voltage for the oxygen sensor on bank 2, sensor 1, is not performing as expected.
The oxygen sensor measures the amount of oxygen in the exhaust gas and sends this information to the engine control module (ECM). The ECM uses this data to adjust the air-fuel mixture for optimal engine performance. The P2248 code is triggered when the ECM detects a problem with the reference voltage sent to the oxygen sensor on bank 2, sensor 1.
• Check Engine Light is on
• Poor fuel economy
• Rough engine idle
• Faulty oxygen sensor
• Wiring issues or poor connections
• ECM malfunction
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections to the oxygen sensor.
• Test the oxygen sensor's reference voltage.
• Replace the faulty oxygen sensor.
• Repair or replace damaged wiring.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regular maintenance checks
• Ensure proper sensor installation
• Avoid using leaded fuel
Sensor Issue
• Get the issue diagnosed and repaired promptly to avoid further damage.
• Monitor fuel economy for any changes.
Check with your vehicle manufacturer for specific warranty coverage on emissions-related components.
This code is relatively common and often related to sensor or wiring issues.
Moderate – Addressing this issue can prevent poor engine performance and increased emissions.
Driving with a faulty oxygen sensor can lead to increased emissions, which may not comply with local environmental regulations.
• Engine at operating temperature
• Vehicle in closed-loop mode
The oxygen sensor is located on the exhaust manifold of bank 2, before the catalytic converter.
Q: What does an oxygen sensor do?
A: An oxygen sensor measures the amount of oxygen in the exhaust gases to help the engine control module adjust the air-fuel mixture.
Q: Can I drive with a P2248 code?
A: While you can drive with this code, it's best to address it soon to avoid poor performance and increased emissions.
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A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant when the code or supporting diagnostics point toward upstream or downstream oxygen-sensor faults.
This code family often involves upstream or downstream oxygen-sensor diagnosis.
Verify exact sensor position and vehicle fitment before buying.
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Fitment Required · Vehicle-fitment part
Relevant when catalyst-efficiency or emissions faults persist after proper diagnosis.
Catalyst-efficiency faults sometimes point toward converter problems after proper testing.
Catalytic converters are highly vehicle-specific and should not be purchased by code alone.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.