Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has a sensor that helps it know how much oxygen is in the exhaust. This code means there's a problem with the wiring or connection for one of these sensors, like a loose wire or a break in the circuit.
The P2240 code indicates an issue with the oxygen sensor's current control circuit on bank 2, sensor 1. This could mean the circuit is open or not functioning properly.
The P2240 code is triggered when the Engine Control Module (ECM) detects an open or malfunction in the positive current control circuit of the oxygen sensor located on bank 2, sensor 1. This sensor is responsible for monitoring the oxygen levels in the exhaust gases to optimize fuel combustion.
• Check Engine Light is on
• Increased fuel consumption
• Poor engine performance
• Faulty oxygen sensor
• Damaged or corroded wiring or connectors
• Faulty Engine Control Module (ECM)
ECM: Engine Control Module
O2 Sensor: Oxygen Sensor
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the oxygen sensor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty oxygen sensor.
• 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 installation of sensors
• Avoid driving through deep water
Sensor Issue
• Get the car checked as soon as possible to avoid further issues.
• Do not ignore the Check Engine Light.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has been associated with wiring issues in vehicles with higher mileage or those exposed to harsh environmental conditions.
Moderate – It should be addressed soon to prevent fuel efficiency loss and potential damage to the catalytic converter.
Driving with an active Check Engine Light may lead to failing emissions tests and can cause further damage to your vehicle.
• Engine at operating temperature
• Vehicle in closed loop mode
The oxygen sensor for bank 2, sensor 1 is typically located on the exhaust manifold of the engine, on the side opposite to cylinder 1.
Q: Can I drive my car with a P2240 code?
A: It's possible to drive for a short time, but it's best to get it checked soon to avoid further damage.
Q: How can I prevent O2 sensor issues?
A: Regular maintenance and avoiding driving through water can help prevent sensor issues.
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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.
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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.
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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.
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.