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 there's a problem with a sensor in your car that helps control pollution. It says the sensor's heater isn't working right on one side of the engine.
The NOx sensor measures nitrogen oxide levels in the exhaust to help reduce emissions. The heater in the sensor helps it work correctly, especially in cold conditions. This code indicates a problem with the heater circuit in the sensor on the second bank of cylinders.
The P2223 code is triggered when the Engine Control Module (ECM) detects a low voltage or resistance issue in the NOx sensor heater circuit on bank 2. This sensor is critical for monitoring and reducing NOx emissions by ensuring the sensor operates efficiently under all conditions.
• Check Engine Light is on
• Poor fuel economy
• Increased emissions
• Faulty NOx sensor
• Wiring issues in the heater circuit
• Blown fuse related to the NOx sensor heater
NOx: Nitrogen Oxides, a group of gases that are harmful pollutants.
Bank 2: The side of the engine opposite to bank 1, typically on V-type engines.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections to the NOx sensor on bank 2.
• Test the NOx sensor heater circuit for proper voltage and resistance.
• Replace the faulty NOx sensor.
• Repair or replace damaged wiring or connectors.
• Replace any blown fuses related to the circuit.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $600
Moderate
• Chevrolet Silverado
• Ford F-150
• Dodge Ram 1500
• Regularly inspect and maintain the exhaust system.
• Ensure proper engine tuning and maintenance.
• Use quality fuel to minimize sensor contamination.
Sensor Issue
• Address the issue promptly to avoid increased emissions.
• Consult a professional mechanic if unsure about repairs.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
This code has become more common with the introduction of stricter emissions standards and the use of NOx sensors in modern vehicles.
Moderate – While the vehicle may still be drivable, addressing the issue is important to maintain emissions compliance and fuel efficiency.
Driving with a faulty NOx sensor may lead to increased emissions, which could violate environmental regulations.
• Engine at operating temperature
• Vehicle running at idle
The NOx sensor is located in the exhaust system, typically downstream of the catalytic converter on bank 2.
Q: Can I drive my car with a P2223 code?
A: Yes, but it's not recommended for long periods as it may increase emissions and reduce fuel efficiency.
Q: How can I prevent NOx sensor issues?
A: Regular maintenance and using high-quality fuel can help prevent sensor issues.
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
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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.