P0051 2004 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 2004 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 2004 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 2004 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 2004 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 2004 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 2004 Infiniti G35 Code
1. What are the common symptoms of OBDII code P0051 in a 2004 Infiniti G35?
- Common symptoms include rough idling, poor fuel efficiency, and the illumination of the check engine light.
2. What does OBDII code P0051 indicate in a 2004 Infiniti G35?
- OBDII code P0051 indicates an issue with the HO2S21 (Heated Oxygen Sensor 2 Bank 2 Sensor 1) heater control circuit being low.
3. What are the possible causes of OBDII code P0051 in a 2004 Infiniti G35?
- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown heater circuit fuse, or issues with the engine control module (ECM).
4. How can I diagnose the cause of OBDII code P0051 in my 2004 Infiniti G35?
- To diagnose the cause, you can perform a visual inspection of the oxygen sensor and its wiring, test the sensor's resistance, check for continuity in the heater circuit, and scan the ECM for any related trouble codes.
5. Can I continue driving my 2004 Infiniti G35 with OBDII code P0051?
- It is not recommended to drive your vehicle for an extended period with code P0051, as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.
6. How can I repair OBDII code P0051 in my 2004 Infiniti G35?
- Repair options include replacing the HO2S21 sensor, repairing any damaged wiring or connectors, replacing the heater circuit fuse if necessary, and resetting the ECM.
7. Is it possible to reset OBDII code P0051 in a 2004 Infiniti G35 without fixing the issue?
- While you can clear the code with an OBDII scanner, it is essential to address the underlying problem to prevent the code from reappearing.
8. How much does it typically cost to repair OBDII code P0051 in a 2004 Infiniti G35?
- The cost of repairing code P0051 can vary depending on the exact cause, but it may range from $150 to $400, including parts and labor.
9. Are there any DIY tips for troubleshooting OBDII code P0051 in a 2004 Infiniti G35?
- DIY tips include checking the oxygen sensor's wiring for damage, testing the sensor's resistance with a multimeter, and ensuring all connectors are securely attached.
10. Can a mechanic easily fix OBDII code P0051 in a 2004 Infiniti G35?
- Yes, a qualified mechanic should be able to diagnose and repair code P0051 efficiently by following the diagnostic steps and replacing any faulty components.
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