AutoCodes – Infiniti – P0158 2004 Infiniti G35

P0158 2004 Infiniti G35 Code - HO2S22 Circuit High Voltage

Quick Answer

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 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: P0158 2004 Infiniti G35 indicates HO2S22 Circuit High Voltage.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 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.

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Code Popularity 4,053

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 Apr 01, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0158 2004 Infiniti G35 Description

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

OBDII Code P0158 2004 Infiniti G35 - HO2S22 Circuit High Voltage - AutoCodes.com — P0158 2004 Infiniti G35 Code - HO2S22 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0158 2004 Infiniti G35?

Faulty Rear Heated Oxygen Sensor Bank 2
Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks
Exhaust gas leaks

How to Fix the DTC P0158 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.

What does this mean?

Code Tech Notes

Replacing the Rear Heated Oxygen Sensor Bank 2 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0158 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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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 P0158 2004 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0158 on a 2004 Infiniti G35?

- Common symptoms include poor fuel economy, rough idling, and potential stalling of the vehicle.

2. What does the HO2S22 Circuit High Voltage code (P0158) indicate in a 2004 Infiniti G35?

- This code indicates that the oxygen sensor located after the catalytic converter is reporting a high voltage condition.

3. What are the potential causes of the HO2S22 Circuit High Voltage code in a 2004 Infiniti G35?

- Causes may include a faulty oxygen sensor (HO2S), wiring issues, a vacuum leak, exhaust leaks, or a problem with the engine's fuel system.

4. How can I diagnose the HO2S22 Circuit High Voltage code on my 2004 Infiniti G35?

- Diagnosing this code typically involves checking the oxygen sensor's wiring, inspecting for leaks in the exhaust system, and testing the sensor's voltage output.

5. Can a dirty or contaminated oxygen sensor trigger the P0158 code on a 2004 Infiniti G35?

- Yes, a dirty or contaminated oxygen sensor can potentially cause inaccurate readings and trigger the high voltage code.

6. What is the recommended repair for resolving the HO2S22 Circuit High Voltage code on a 2004 Infiniti G35?

- The recommended repair usually involves replacing the faulty oxygen sensor (HO2S) and addressing any underlying wiring or exhaust system issues.

7. Is it safe to continue driving with the P0158 code illuminated on a 2004 Infiniti G35?

- While the vehicle may still be operable, it is not recommended to drive for an extended period with this code as it can lead to decreased fuel efficiency and potential engine performance issues.

8. Can resetting the OBDII system clear the P0158 code on a 2004 Infiniti G35?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear upon driving the vehicle.

9. How can I prevent the HO2S22 Circuit High Voltage code from reoccurring on my 2004 Infiniti G35?

- Regular maintenance of the oxygen sensors, fuel system, and exhaust system can help prevent the recurrence of this code. It is also essential to address any issues promptly when they arise.

10. Will ignoring the P0158 code lead to more severe problems in a 2004 Infiniti G35?

- Ignoring the P0158 code can potentially lead to decreased fuel efficiency, engine performance issues, and even damage to the catalytic converter over time. It is advisable to address the problem promptly to avoid further complications.