AutoCodes – Infiniti – P0052 Infiniti

P0052 Infiniti Code - HO2S21 Heater Control Circuit High

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 Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection, Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1. 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: P0052 Infiniti indicates HO2S21 Heater Control Circuit High.
Common causes: Common causes include Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground, Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection, Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1.
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 Popularity 4,390

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0052 Infiniti Description

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. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
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.

OBDII Code P0052 Infiniti - HO2S21 Heater Control Circuit High - AutoCodes.com — P0052 Infiniti Code - HO2S21 Heater Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0052 Infiniti?

Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection
Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0052 Infiniti?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0052 Infiniti 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.

Need more information about the P0052 Infiniti code?

Need more information on how to fix the P0052 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0052 Infiniti code diagnosed by a professional: Find a repair shop in your area

Information for Specific Infiniti Models

P0052 2003 Infiniti G35 — HO2S21 Heater Control Circuit High
P0052 2004 Infiniti G35 — HO2S21 Heater Control Circuit High
P0052 2005 Infiniti G35 — Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit High
P0052 2006 Infiniti G35 — Air Fuel Ratio Sensor 1 Heater Bank 2 Control Circuit High

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 P0052 Infiniti Code

1. What does OBDII code P0052 for an Infiniti mean?

The code P0052 on an Infiniti indicates a malfunction in the HO2S21 (Heated Oxygen Sensor 2 Bank 2) heater control circuit, showing that the sensor is detecting a high voltage condition.

2. What are the common symptoms of OBDII code P0052 in an Infiniti?

Common symptoms of code P0052 in an Infiniti may include poor fuel economy, rough idling, loss of power, and the illumination of the check engine light on the dashboard.

3. What could cause the OBDII code P0052 on an Infiniti?

The most common causes of code P0052 in an Infiniti are a faulty HO2S21 sensor, damaged wiring or connectors in the sensor circuit, or issues with the vehicle's engine control module (ECM).

4. How serious is the OBDII code P0052 in an Infiniti?

While the vehicle may still be operable with code P0052, it is important to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance and fuel efficiency.

5. Can I continue driving my Infiniti with the OBDII code P0052?

It is generally safe to drive your Infiniti with code P0052, but it is recommended to have the issue diagnosed and repaired as soon as possible to avoid further complications and potential damage to other components.

6. How can I diagnose and repair OBDII code P0052 in my Infiniti?

Diagnosing code P0052 typically involves testing the HO2S21 sensor, inspecting the wiring and connectors for damage, and checking the ECM for any faults. Repair may involve replacing the sensor, repairing the wiring, or reprogramming the ECM.

7. Are there any DIY tips for fixing OBDII code P0052 on an Infiniti?

While diagnosing and repairing code P0052 may require specialized tools and expertise, simple DIY steps like checking the sensor connections and fuses, and ensuring proper wiring integrity could help in some cases.

8. How much does it cost to fix OBDII code P0052 on an Infiniti?

The cost of fixing code P0052 on an Infiniti can vary depending on the specific cause of the issue, labor rates in your area, and whether you choose to address the problem yourself or take it to a professional mechanic.

9. Will resetting the check engine light resolve OBDII code P0052 in an Infiniti?

Resetting the check engine light may temporarily turn it off, but if the underlying issue triggering code P0052 is not addressed, the light will likely come back on once the ECM detects the problem again.

10. How can I prevent OBDII code P0052 from occurring in my Infiniti?

To prevent code P0052 in your Infiniti, it is essential to ensure regular maintenance, timely replacement of oxygen sensors as recommended, and addressing any issues related to the vehicle's emissions and fuel system promptly.