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 thinks two oxygen sensors on the same side of the engine got mixed up.
The engine control module (ECM) has detected that the signals from two oxygen sensors on Bank 2 are swapped.
This code indicates that the ECM has received signals from the oxygen sensors on Bank 2 that appear to be swapped. The sensors are responsible for measuring the amount of oxygen in the exhaust gases, which helps the ECM manage the air-fuel mixture. If the signals are swapped, it can lead to incorrect fuel management.
• Check Engine Light is on
• Poor fuel economy
• Rough engine idle
• Wiring issues causing swapped signals
• Incorrectly installed oxygen sensors
• Faulty oxygen sensors
ECM: Engine Control Module
Oxygen Sensor: A device that measures the oxygen level in the exhaust gases
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for the oxygen sensors on Bank 2.
• Check if the sensors are installed correctly.
• Correct any wiring issues found.
• Reinstall the oxygen sensors correctly if they are swapped.
• Replace faulty oxygen sensors.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• Toyota Camry
• Ford F-150
• Chevrolet Silverado
• Ensure proper installation of sensors during maintenance.
• Regularly inspect sensor wiring.
• Use quality replacement parts.
Sensor Issue
• Have a professional mechanic inspect the vehicle.
• Avoid driving the vehicle for long periods with the Check Engine Light on.
Check vehicle warranty for coverage on emissions-related components.
This code has been associated with incorrect sensor installations and wiring issues.
Moderate – It should be addressed soon to prevent further engine performance issues.
Driving with a faulty oxygen sensor can lead to increased emissions and may not comply with emissions regulations.
• Engine at operating temperature
• Vehicle in closed-loop mode
Oxygen sensors are located in the exhaust system, typically before and after the catalytic converter on Bank 2.
Q: Can I drive my car with a P241B code?
A: It's not recommended as it can affect fuel efficiency and emissions.
Q: How do I know if my oxygen sensors are swapped?
A: A professional mechanic can diagnose this using specialized tools and techniques.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
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.
View options on Amazon
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.