Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that a sensor in your car that checks the air and fuel mix isn't working right when you slow down. It's like a nose that can't smell properly.
The O2 sensor measures the amount of oxygen in the exhaust gases. If it detects values that are out of the expected range during deceleration, it triggers this code.
The P2379 code indicates that the oxygen sensor located on Bank 2, Sensor 2, is reporting values that are outside of the expected range during vehicle deceleration. This may affect the engine's air-fuel mixture and emissions.
• Check Engine Light is on
• Poor fuel economy
• Rough idling
• Faulty O2 sensor
• Exhaust leak
• Wiring issues or poor connections
O2 Sensor: A device that measures the oxygen level in the exhaust gases.
Bank 2: The side of the engine opposite Bank 1, typically on V-type engines.
• Use an OBD-II scanner to confirm the code.
• Inspect the O2 sensor and its wiring for damage.
• Check for exhaust leaks near the sensor.
• Replace the faulty O2 sensor.
• Repair or replace damaged wiring.
• Seal any exhaust leaks.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $300
Moderate
• Toyota Camry
• Ford F-150
• Honda Accord
• Regularly inspect and maintain the exhaust system.
• Ensure proper sensor installation.
• Use high-quality fuel.
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid ignoring the Check Engine Light.
• Monitor fuel consumption for any changes.
Check with your vehicle manufacturer; emissions components may be covered under warranty.
This code has been associated with sensor failures and exhaust system issues in various models.
Moderate – Address the issue to prevent further engine or emissions problems.
Driving with a malfunctioning O2 sensor can lead to increased emissions, which may violate local environmental laws.
• Vehicle must be decelerating.
• Engine should be at operating temperature.
The O2 sensor is located on the exhaust pipe after the catalytic converter on the side of the engine with the second bank of cylinders.
Q: Can I drive with a P2379 code?
A: It's possible, but not recommended as it can lead to increased emissions and potential engine damage.
Q: How can I prevent O2 sensor issues?
A: Regular maintenance and using quality fuel can help prevent sensor issues.
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A wired color-screen reader with readiness hotkeys, live data, code definitions, and data logging.
Good for emissions-related codes because it exposes readiness monitors and live powertrain data.
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Specialty · Smoke machine
Helpful for finding EVAP and vacuum leaks that are hard to see with visual inspection alone.
Helpful for tracking down EVAP and vacuum leaks that can trigger emissions faults.
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Specialty · O2 sensor socket
Helpful when the code points toward exhaust or oxygen-sensor work and space is tight.
Useful when the diagnosis points toward oxygen-sensor removal or replacement.
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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.