P2240 Fault Code

O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2240 fault code indicates an issue with the O2 (oxygen) sensor positive current control circuit for Bank 2, specifically Sensor 1. This sensor is crucial for monitoring the level of oxygen in the exhaust gases, helping to optimize fuel efficiency and reduce emissions. When this error code is triggered, it implies that there may be a circuit problem which can stem from wiring issues or a malfunctioning sensor itself.

What are the symptoms of the P2240 code?

Symptoms that may accompany the P2240 code are:

• Illuminated check engine light on the dashboard.
• Poor fuel economy due to improper fuel-to-air mixture.
• Increased emissions that may cause the vehicle to fail an emissions test.
• Rough engine idle or performance issues.

What causes the P2240 code?

Common causes of the P2240 code include:

• Damaged or frayed wiring in the O2 sensor circuit.
• Poor electrical connections that cause an open circuit.
• A faulty O2 sensor that does not respond as required.
• A blown fuse related to the O2 sensor system.
• Malfunctions in the engine control module (ECM) or other related components.

How to fix P2240?

To resolve the P2240 code, the following steps are typically recommended:

• Inspect the wiring and connectors for damage, corrosion, or looseness, and repair as needed.
• Test the O2 sensor for proper operation using a multimeter and replace it if faulty.
• Check the vehicle's fuse box for any blown fuses and replace them if necessary.
• Clear the fault code and perform a test drive to ensure that the issue is resolved and the code does not reappear.