P0051 Infiniti Code - Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low
Quick Answer
The P0051 Infiniti code indicates a problem with the Air Fuel Ratio (A/F) Sensor 1 Heater Bank 2 Control Circuit in the vehicle. Common causes include Faulty A/F Sensor: The A/F sensor itself may be faulty and unable to provide accurate readings, Wiring or Connector Damage: Damage to the wiring or connectors in the heater circuit can prevent proper voltage from reaching the sensor, Blown Fuse: A blown fuse in the heater circuit 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 Infiniti indicates Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low.
- Common causes
- Common causes include Faulty A/F Sensor: The A/F sensor itself may be faulty and unable to provide accurate readings, Wiring or Connector Damage: Damage to the wiring or connectors in the heater circuit can prevent proper voltage from reaching the sensor, Blown Fuse: A blown fuse in the heater circuit 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.
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Code P0051 Infiniti Description
The P0051 Infiniti code indicates a problem with the Air Fuel Ratio (A/F) Sensor 1 Heater Bank 2 Control Circuit in the vehicle. This sensor is responsible for measuring the air-fuel ratio in the exhaust system and sending this information to the engine control module (ECM) for proper fuel delivery. The heater circuit in the sensor helps it reach operating temperature quickly for accurate readings.
Common Causes of P0051 Infiniti
- Faulty A/F Sensor: The A/F sensor itself may be faulty and unable to provide accurate readings.
- Wiring or Connector Damage: Damage to the wiring or connectors in the heater circuit can prevent proper voltage from reaching the sensor.
- Blown Fuse: A blown fuse in the heater circuit can disrupt the flow of electricity to the sensor.
- ECM Malfunction: A malfunctioning ECM can also cause issues with the control circuit of the A/F sensor.
Symptoms of P0051 Infiniti
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
- Decreased Fuel Efficiency: A faulty A/F sensor can lead to incorrect fuel delivery, resulting in decreased fuel efficiency.
- Rough Idling: Incorrect air-fuel ratio readings can cause the engine to idle roughly or inconsistently.
- Engine Misfires: The engine may experience misfires or hesitation during acceleration due to inaccurate fuel delivery.
- Emission Issues: This code can also lead to increased emissions, potentially causing the vehicle to fail emissions tests.
How to Fix P0051 Infiniti
- Diagnose the Issue: Use a diagnostic scanner to retrieve the specific trouble code and pinpoint the exact cause of the problem.
- Inspect Wiring and Connectors: Check the wiring and connectors in the A/F Sensor 1 Heater Bank 2 circuit for any damage or corrosion.
- Test Fuse: Verify that the fuse related to the heater circuit is intact and functioning properly.
- Replace A/F Sensor: If the sensor is found to be faulty, replace it with a new, OEM-quality sensor.
- Clear Codes and Test Drive: After completing the repair, clear the trouble codes from the ECM, and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0051 Infiniti
The typical repair costs for addressing a P0051 Infiniti code can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the price of a new A/F sensor, any necessary wiring repairs, and the labor involved in diagnosing and fixing the problem. It's important to note that the actual cost can vary based on the location of the repair shop, the make and model of the vehicle, and the hourly labor rates charged. It's recommended to obtain a detailed quote from a trusted auto repair shop before proceeding with the repair.
When is the Code Detected?
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Information for Specific Infiniti Models
- P0051 2003 Infiniti G35 — HO2S21 Heater Control Circuit Low
- P0051 2004 Infiniti G35 — HO2S21 Heater Control Circuit Low
- P0051 2005 Infiniti G35 — Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low
- P0051 2006 Infiniti G35 — Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit Low
Frequently Asked Questions about P0051 Infiniti Code
No Frequently Asked Questions about P0051 Infiniti Code found.
Discuss the causes and fixes for P0051 Infiniti OBDII Code
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This P0051 explanation sums up the reason I didn't pass inspection for the first time. Will this problem also effect the RPMs? There is a high pitched whine in the engine since this started. I haven't replaced any parts yet.
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What model and year is your vehicle?
Air-Fuel Ratio (A/F) Sensor problems usually doesn't affect the RPM or produce any noise. It is possible that you have an intake or exhaust leaks, that will cause a noise, bad sensor reading and affect the RPM.
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2004 Infiniti I35. First problem I have ever had with it. Love this car. I'm hoping it isn't expensive
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Unfortunately there is no much help I can give you from here. You have to have a mechanic inspect the noise and sensor.
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