P2243 Fault Code

O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1

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

The P2243 code indicates an issue with the O2 sensor reference voltage circuit for Bank 1 Sensor 1. This sensor plays a crucial role in monitoring the oxygen level in the exhaust gases to help maintain optimal fuel efficiency and emissions control. When the voltage circuit is open or there’s a problem with the sensor itself, it can lead to poor engine performance and increased emissions.

What are the symptoms of the P2243 code?

Drivers may notice several symptoms when a P2243 code is active, such as:

• Decreased fuel efficiency due to incorrect air-fuel mixture.
• Rough engine idle or performance issues.
• Check Engine Light illuminated on the dashboard.
• Potential increase in exhaust emissions leading to failed emissions tests.

What causes the P2243 code?

The potential causes for a P2243 code include:

• A damaged or corroded wiring harness or connector for the O2 sensor.
• An open circuit in the reference voltage supply to the sensor.
• A malfunctioning O2 sensor that is unable to communicate correctly with the engine control unit (ECU).
• Failures in the ECU itself affecting sensor readings.

How to fix P2243?

To resolve a P2243 code, the following steps are typically recommended:

• Inspect the wiring and connectors for the O2 sensor for any signs of damage or corrosion.
• Use a multimeter to test the reference voltage supply to the sensor and check for continuity in the circuit.
• Replace the O2 sensor if it is found to be faulty.
• Clear the code and perform a test drive to ensure the issue has been resolved and the Check Engine Light does not reappear.