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 part that checks how much oxygen is in the exhaust. It's like when you have a toy that isn't working right because the batteries are not connected properly.
This code indicates that the reference voltage for the oxygen sensor located in Bank 1, Sensor 2 is not performing as expected.
The P22AF code is triggered when the Engine Control Module (ECM) detects an issue with the reference voltage for the downstream oxygen sensor (Bank 1, Sensor 2). This reference voltage is crucial for the sensor to accurately measure the oxygen content in the exhaust gases and provide feedback for optimal engine performance.
• Check Engine Light is on
• Poor fuel economy
• Engine runs rough
• Faulty oxygen sensor
• Damaged wiring or connectors
• Faulty ECM
ECM: Engine Control Module, the computer that manages engine functions.
Oxygen Sensor: A device that measures the amount of oxygen in the exhaust gases.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the oxygen sensor for proper operation.
• Replace the faulty oxygen sensor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance checks
• Ensure proper electrical connections
• Use high-quality fuel
Sensor Issue
• Avoid driving long distances until repaired.
• Have a professional mechanic inspect the vehicle.
Check with your vehicle manufacturer for specific warranty coverage on emissions-related components.
This code has been associated with issues in vehicles with high mileage or those that have not undergone regular maintenance.
Moderate – It should be addressed soon to prevent further engine performance issues.
Ignoring emissions-related codes can lead to increased pollution and may result in failing emissions tests.
• Engine at operating temperature
• Vehicle running at idle
The oxygen sensor for Bank 1, Sensor 2 is typically located downstream in the exhaust system, after the catalytic converter.
Q: Can I drive with a P22AF code?
A: It's possible to drive short distances, but it's recommended to fix the issue soon to avoid further problems.
Q: How do I know if the oxygen sensor is bad?
A: Symptoms include poor fuel economy, rough engine idle, and the Check Engine Light being on.
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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.