• Check Engine Light is on
• Poor fuel economy
• Rough engine idle
• Faulty oxygen sensor
• Wiring issues or open circuit
• Faulty ECM
ECM: Engine Control Module, the computer that controls the engine's functions.
Oxygen Sensor: A device that measures the amount of oxygen in the exhaust gases.
• P2238
• P2239
O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1
This code means that the car's computer has detected a problem with the oxygen sensor in the engine. It's like a nose that sniffs the air coming out of the engine to make sure it's clean, but right now, it's not working properly.
The P2237 code indicates that the engine control module (ECM) has detected an issue with the current control circuit for the oxygen sensor located at Bank 1 Sensor 1.
The P2237 code is triggered when the ECM detects an open or malfunction in the positive current control circuit of the upstream oxygen sensor (Bank 1 Sensor 1). This sensor is responsible for measuring the oxygen level in the exhaust gases before they reach the catalytic converter, helping the ECM adjust the air-fuel mixture for optimal combustion.
• 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
• Wrench set
$150 - $400
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regularly inspect and maintain the exhaust system.
• Ensure proper engine tune-ups.
• Use high-quality fuel.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional mechanic.
• Avoid driving the vehicle extensively until the issue is resolved.
Oxygen sensors may be covered under the vehicle's emissions warranty.
The P2237 code has been associated with vehicles that have aged oxygen sensors or have experienced wiring issues due to environmental factors.
Moderate – It should be addressed soon to prevent potential damage to the catalytic converter and to maintain fuel efficiency.
Driving with a malfunctioning oxygen sensor can lead to increased emissions, which may not comply with local emissions regulations.
• Engine at operating temperature
• Vehicle in closed-loop mode
The oxygen sensor is located in the exhaust manifold of Bank 1, upstream of the catalytic converter.
Q: Can I drive with a P2237 code?
A: It's not recommended to drive extensively with this code, as it can lead to poor fuel economy and potential damage to the catalytic converter.
Q: How often should oxygen sensors be replaced?
A: Oxygen sensors typically last between 60,000 to 90,000 miles, but it's best to follow the manufacturer's recommendations.
