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P2249 Ford Code - O2 Sensor Reference Voltage Circuit Low Bank 2 Sensor 1

Quick Answer

The P2249 Ford diagnostic trouble code (DTC) refers to an issue with the O2 sensor reference voltage circuit on Bank 2 Sensor 1 of the vehicle's engine. Common causes include Faulty O2 Sensor: The O2 sensor itself may be malfunctioning, causing the reference voltage circuit to read low, Wiring Issues: Damaged or corroded wiring connecting the O2 sensor to the ECM can disrupt the voltage signal, ECM Malfunction: A problem with the engine control module can affect the voltage supplied to the O2 sensor. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P2249 Ford indicates O2 Sensor Reference Voltage Circuit Low Bank 2 Sensor 1.
Common causes
Common causes include Faulty O2 Sensor: The O2 sensor itself may be malfunctioning, causing the reference voltage circuit to read low, Wiring Issues: Damaged or corroded wiring connecting the O2 sensor to the ECM can disrupt the voltage signal, ECM Malfunction: A problem with the engine control module can affect the voltage supplied to the O2 sensor.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P2249 Ford Description

The P2249 Ford diagnostic trouble code (DTC) refers to an issue with the O2 sensor reference voltage circuit on Bank 2 Sensor 1 of the vehicle's engine. The O2 sensor, also known as the oxygen sensor, plays a crucial role in monitoring the air-to-fuel ratio in the exhaust gases. This specific sensor is located on the exhaust manifold of Bank 2, which is typically the side of the engine where cylinder #2 is located.

OBDII Code P2249 Ford - O2 Sensor Reference Voltage Circuit Low Bank 2 Sensor 1
P2249 Ford Code - O2 Sensor Reference Voltage Circuit Low Bank 2 Sensor 1

Common Causes of P2249 Ford

  1. Faulty O2 Sensor: The O2 sensor itself may be malfunctioning, causing the reference voltage circuit to read low.
  2. Wiring Issues: Damaged or corroded wiring connecting the O2 sensor to the ECM can disrupt the voltage signal.
  3. ECM Malfunction: A problem with the engine control module can affect the voltage supplied to the O2 sensor.
  4. Exhaust System Leaks: Leaks in the exhaust system can affect the O2 sensor's readings, triggering the P2249 code.

Symptoms of P2249 Ford

  1. Check Engine Light: The most common symptom associated with the P2249 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Poor Fuel Economy: A malfunctioning O2 sensor can cause the engine to run rich or lean, leading to decreased fuel efficiency.
  3. Rough Idle: The engine may idle roughly or inconsistently due to incorrect air-to-fuel ratios.
  4. Decreased Performance: The vehicle may exhibit a lack of power or acceleration, especially during acceleration.

How to Fix P2249 Ford

  1. Diagnose the Issue: Use an OBD-II scanner to read the trouble code and further diagnose the problem with the O2 sensor reference voltage circuit.
  2. Inspect Wiring: Check the wiring harness connecting the O2 sensor to the ECM for any damage or corrosion. Repair or replace any faulty wiring.
  3. Test O2 Sensor: Test the O2 sensor itself to determine if it is functioning correctly. Replace the sensor if necessary.
  4. Check ECM: Ensure that the engine control module is operating properly and supplying the correct voltage to the O2 sensor.
  5. Clear Codes: After making the necessary repairs, clear the diagnostic trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2249 Ford

The cost of repairing the P2249 Ford code can vary depending on the underlying cause of the issue and the specific parts and labor required. On average, the cost of replacing an O2 sensor can range from $100 to $300, while addressing wiring issues or ECM malfunctions may incur additional costs. Labor rates at auto repair shops typically range from $80 to $150 per hour, with rates potentially higher at dealerships or in metropolitan areas. It's advisable to consult with a trusted mechanic for a more accurate estimate based on your vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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