P0051 2003 Infiniti G35 Code - HO2S21 Heater Control Circuit Low
Quick Answer
Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection. 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 2003 Infiniti G35 indicates HO2S21 Heater Control Circuit Low.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection.
- 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.
Code P0051 2003 Infiniti G35 Description
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
What are the Possible Causes of the DTC P0051 2003 Infiniti G35?
- Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection
- Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 fuse
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0051 2003 Infiniti G35?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0051 2003 Infiniti G35 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0051 2003 Infiniti G35 Code
1. What are common symptoms of OBDII code P0051 on a 2003 Infiniti G35?
- Common symptoms include poor fuel economy, rough idling, and the illumination of the Check Engine Light.
2. What does the OBDII code P0051 indicate in a 2003 Infiniti G35?
- The code P0051 indicates a malfunction in the HO2S21 (Heated Oxygen Sensor Bank 2 Sensor 1) heater control circuit.
3. What are possible causes of the P0051 code in a 2003 Infiniti G35?
- Possible causes include a faulty HO2S21 sensor, damaged wiring or connectors in the heater circuit, or a blown fuse related to the sensor.
4. How can I diagnose the P0051 code on my 2003 Infiniti G35?
- Diagnosing the P0051 code involves checking the HO2S21 sensor for proper operation, inspecting the wiring and connectors for damage, and testing the related fuses.
5. Can I drive my 2003 Infiniti G35 with the P0051 code active?
- It is not recommended to drive the vehicle with the P0051 code active, as it can lead to poor engine performance and potential damage over time.
6. How can I repair the P0051 code on my 2003 Infiniti G35?
- Repairing the P0051 code may involve replacing the HO2S21 sensor, repairing damaged wiring or connectors, or replacing any blown fuses related to the sensor.
7. Are there any DIY tips for fixing the P0051 code on a 2003 Infiniti G35?
- DIY tips include ensuring the sensor is properly connected, checking for visible damage to the wiring, and consulting the vehicle's service manual for specific repair steps.
8. Can a faulty HO2S21 sensor cause other issues besides triggering the P0051 code?
- Yes, a faulty HO2S21 sensor can lead to poor fuel economy, increased emissions, and potential damage to the catalytic converter if left unresolved.
9. How much does it typically cost to repair the P0051 code on a 2003 Infiniti G35?
- The cost of repairing the P0051 code can vary depending on the exact cause, but it may range from $100 to $300 for parts and labor.
10. Should I reset the Check Engine Light after fixing the P0051 code on my 2003 Infiniti G35?
- Yes, it is recommended to reset the Check Engine Light using an OBDII scanner after fixing the P0051 code to clear the error code and ensure proper functioning of the system.
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