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

Quick Answer

The P2249 diagnostic trouble code (DTC) in Honda vehicles indicates a problem with the O2 (oxygen) sensor reference voltage circuit on bank 2 sensor 1. Common causes include Faulty O2 Sensor: The O2 sensor on bank 2 sensor 1 may be damaged or malfunctioning, causing the reference voltage circuit to read low, Wiring Issues: Corrosion, breaks, or short circuits in the wiring connected to the O2 sensor can disrupt the reference voltage circuit, ECM Malfunction: A problem with the engine control module (ECM) can also lead to issues with the reference voltage circuit for 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 Honda indicates O2 Sensor Reference Voltage Circuit Low Bank 2 Sensor 1.
Common causes
Common causes include Faulty O2 Sensor: The O2 sensor on bank 2 sensor 1 may be damaged or malfunctioning, causing the reference voltage circuit to read low, Wiring Issues: Corrosion, breaks, or short circuits in the wiring connected to the O2 sensor can disrupt the reference voltage circuit, ECM Malfunction: A problem with the engine control module (ECM) can also lead to issues with the reference voltage circuit for 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 Honda Description

The P2249 diagnostic trouble code (DTC) in Honda vehicles indicates a problem with the O2 (oxygen) sensor reference voltage circuit on bank 2 sensor 1. The O2 sensor plays a crucial role in measuring the oxygen content in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. In this case, the reference voltage circuit for the O2 sensor on bank 2 sensor 1 is reading lower than the specified range, indicating a potential issue with the sensor's ability to accurately measure the oxygen levels.

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

Common Causes of P2249 Honda

  1. Faulty O2 Sensor: The O2 sensor on bank 2 sensor 1 may be damaged or malfunctioning, causing the reference voltage circuit to read low.
  2. Wiring Issues: Corrosion, breaks, or short circuits in the wiring connected to the O2 sensor can disrupt the reference voltage circuit.
  3. ECM Malfunction: A problem with the engine control module (ECM) can also lead to issues with the reference voltage circuit for the O2 sensor.
  4. Exhaust Leaks: Leaks in the exhaust system can affect the O2 sensor's readings and cause the reference voltage circuit to be low.
  5. Sensor Placement: Improper installation or mounting of the O2 sensor can lead to incorrect readings and trigger this code.

Symptoms of P2249 Honda

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Poor Fuel Economy: A malfunctioning O2 sensor can lead to incorrect air-fuel mixture adjustments, resulting in decreased fuel efficiency.
  3. Rough Idling: The engine may experience rough idling or stalling due to incorrect fuel mixture ratios.
  4. Increased Emissions: A faulty O2 sensor can cause the vehicle to emit higher levels of pollutants, leading to increased emissions during vehicle operation.

How to Fix P2249 Honda

  1. Diagnose the Issue: Use a scan tool to read the DTC and identify the specific O2 sensor causing the problem.
  2. Inspect Wiring: Check the wiring harness for any damage, corrosion, or loose connections. Repair or replace any faulty wiring.
  3. Replace O2 Sensor: If the O2 sensor is faulty, replace it with a new sensor compatible with the vehicle's make and model.
  4. Clear DTC: After completing the repair, clear the DTC from the ECM using a scan tool to reset the check engine light.
  5. Test Drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the check engine light does not reappear.

Cost to Fix P2249 Honda

The cost of repairing a P2249 O2 Sensor Reference Voltage Circuit Low Bank 2 Sensor 1 code can vary depending on the specific vehicle make and model, the location of the repair shop, and the cost of parts and labor. In general, the cost of replacing an O2 sensor and addressing wiring issues can range from $200 to $500, including parts and labor. Additional diagnostic fees may apply, and labor rates at auto repair shops typically range from $80 to $150 per hour. It is recommended to consult with a certified mechanic or repair shop for a more accurate cost estimate based on your vehicle's unique circumstances.

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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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