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P0051 2005 Infiniti G35 Code - Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low

Quick Answer

The P0051 diagnostic trouble code (DTC) for a 2005 Infiniti G35 refers to the Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low. Common causes include Faulty Air Fuel Ratio Sensor: The sensor itself may be damaged or worn out, causing the heater circuit to malfunction, Heater Element Failure: The heating element within the air fuel ratio sensor may fail, preventing it from reaching the required temperature, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the flow of electricity to the 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
P0051 2005 Infiniti G35 indicates Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low.
Common causes
Common causes include Faulty Air Fuel Ratio Sensor: The sensor itself may be damaged or worn out, causing the heater circuit to malfunction, Heater Element Failure: The heating element within the air fuel ratio sensor may fail, preventing it from reaching the required temperature, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the flow of electricity to the 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 15, 2024
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Code P0051 2005 Infiniti G35 Description

The P0051 diagnostic trouble code (DTC) for a 2005 Infiniti G35 refers to the Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low. This code indicates that there is a problem with the heating element circuit of the air fuel ratio sensor located in bank 2 of the engine. The air fuel ratio sensor, also known as the oxygen sensor, plays a crucial role in monitoring and adjusting the air-fuel mixture in the engine for optimal combustion efficiency.

OBDII Code P0051 2005 Infiniti G35 - Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low
P0051 2005 Infiniti G35 Code - Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low

Common Causes of P0051 2005 Infiniti G35

  1. Faulty Air Fuel Ratio Sensor: The sensor itself may be damaged or worn out, causing the heater circuit to malfunction.
  2. Heater Element Failure: The heating element within the air fuel ratio sensor may fail, preventing it from reaching the required temperature.
  3. Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can disrupt the flow of electricity to the sensor.
  4. ECM Malfunction: A malfunctioning engine control module (ECM) can prevent the proper operation of the air fuel ratio sensor heater circuit.
  5. Environmental Factors: Exposure to extreme temperatures or harsh driving conditions can contribute to premature sensor failure.

Symptoms of P0051 2005 Infiniti G35

  1. Check Engine Light: The most common symptom associated with the P0051 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning air fuel ratio sensor heater can lead to poor fuel efficiency as the engine struggles to adjust the air-fuel mixture accurately.
  3. Rough Idling: The engine may exhibit rough idling or stalling when the air fuel ratio sensor is not functioning correctly.
  4. Poor Acceleration: Acceleration may feel sluggish or inconsistent due to improper air-fuel mixture adjustments.
  5. Increased Emissions: A faulty air fuel ratio sensor can result in higher emissions output, potentially causing the vehicle to fail emissions tests.

How to Fix P0051 2005 Infiniti G35

  1. Diagnose the Issue: Use an OBD-II scanner to retrieve the trouble code and perform further diagnostics to pinpoint the exact cause of the P0051 code.
  2. Inspect the Air Fuel Ratio Sensor: Check the sensor for any visible damage or signs of wear. Test the sensor's heater element for continuity to determine if it is functioning properly.
  3. Check Wiring and Connections: Inspect the wiring harness for any damage, corrosion, or loose connections that may be affecting the heater circuit.
  4. Replace the Air Fuel Ratio Sensor: If the sensor is faulty, replace it with a new, OEM-quality sensor to ensure proper operation.
  5. Clear the Code: After completing the repair, clear the trouble code from the ECM's memory using the OBD-II scanner to reset the check engine light.

Cost to Fix P0051 2005 Infiniti G35

The typical repair costs for addressing a P0051 code on a 2005 Infiniti G35 can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships, while independent shops often offer lower rates. For a more accurate estimate, it's recommended to inquire about local rates before proceeding with the repair.

What does this mean?

Tech Notes for P0051 2005 Infiniti G35

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.

When is the Code Detected?

The P0051 is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit

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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.

Frequently Asked Questions about P0051 2005 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0051 on a 2005 Infiniti G35?

- Common symptoms include poor fuel economy, rough idling, and a noticeable drop in engine performance.

2. What can cause the OBDII code P0051 on a 2005 Infiniti G35?

- The code P0051 typically indicates a malfunction in the Air Fuel Ratio Sensor 1 Heater Bank 2 control circuit, which could be caused by a faulty sensor, wiring issues, or a blown fuse.

3. How can I diagnose the OBDII code P0051 on my 2005 Infiniti G35?

- Diagnosing the code involves checking the sensor's wiring, connections, and resistance values, as well as inspecting the fuse related to the sensor heater circuit.

4. Can I drive my 2005 Infiniti G35 with the OBDII code P0051?

- It is not recommended to drive the vehicle with the code P0051 present, as it can lead to further damage and potential safety hazards.

5. How do I repair the OBDII code P0051 on a 2005 Infiniti G35?

- Repairing the code typically involves replacing the faulty Air Fuel Ratio Sensor 1 on Bank 2 and addressing any wiring or fuse issues in the sensor heater circuit.

6. Are there any tips to prevent the OBDII code P0051 from recurring on a 2005 Infiniti G35?

- Regular maintenance, such as keeping the sensor and its connections clean, can help prevent the code from recurring. Additionally, addressing any underlying issues promptly can prevent further problems.

7. How much does it cost to fix the OBDII code P0051 on a 2005 Infiniti G35?

- The cost of fixing the code can vary depending on the cause of the issue, but it typically involves the cost of a new Air Fuel Ratio Sensor 1 and any labor charges for the repair.

8. Can I reset the OBDII code P0051 on my 2005 Infiniti G35 without fixing the issue?

- While you can clear the code using an OBDII scanner, it is not recommended to do so without addressing the underlying problem, as the code is likely to reappear.

9. How long does it take to repair the OBDII code P0051 on a 2005 Infiniti G35?

- The repair time can vary based on the extent of the issue and the availability of parts, but it typically takes a few hours to replace the Air Fuel Ratio Sensor 1 and address any related wiring problems.

10. Will the OBDII code P0051 cause my 2005 Infiniti G35 to fail an emissions test?

- Yes, the code P0051 can cause the vehicle to fail an emissions test due to its impact on the air-fuel ratio control system. It is important to address the issue before undergoing emissions testing.

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