AutoCodes – Infiniti – P0159 2005 Infiniti G35

P0159 2005 Infiniti G35 Code - HO2S22 Slow Response

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: P0159 2005 Infiniti G35 indicates HO2S22 Slow Response.
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 2,934

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 P0159 2005 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 P0159 2005 Infiniti G35 - HO2S22 Slow Response - AutoCodes.com — P0159 2005 Infiniti G35 Code - HO2S22 Slow Response

What does this mean?

What are the Possible Causes of the DTC P0159 2005 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 may be faulty
Exhaust gas leaks

How to Fix the DTC P0159 2005 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 O2 Sensor 2 usually takes care of the problem

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0159 2005 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 P0159 2005 Infiniti G35 Code

1. What are the common symptoms of OBDII code P0159 on a 2005 Infiniti G35?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

2. What does the OBDII code P0159 for a 2005 Infiniti G35 indicate?

- OBDII code P0159 specifically refers to a slow response from the downstream oxygen sensor (HO2S22) located after the catalytic converter.

3. What are the possible causes of OBDII code P0159 on a 2005 Infiniti G35?

- Potential causes include a faulty downstream oxygen sensor (HO2S22), wiring issues in the sensor circuit, exhaust leaks, or a malfunctioning catalytic converter.

4. How can I diagnose the cause of OBDII code P0159 on my 2005 Infiniti G35?

- Diagnosing the issue may involve inspecting the downstream oxygen sensor, checking for wiring damage, performing a visual inspection of the exhaust system, and conducting a scan tool analysis.

5. Can I still drive my 2005 Infiniti G35 with OBDII code P0159 present?

- It is generally not recommended to drive the vehicle with a P0159 code as it can lead to decreased fuel efficiency and potential engine performance issues.

6. How can I repair OBDII code P0159 on my 2005 Infiniti G35?

- Repair options may include replacing the downstream oxygen sensor, repairing any damaged wiring, fixing exhaust leaks, or replacing the catalytic converter if necessary.

7. Are there any DIY tips for addressing OBDII code P0159 on a 2005 Infiniti G35?

- DIY enthusiasts can start by inspecting the sensor connections and wiring, checking for exhaust leaks, and ensuring the sensor is properly seated and functioning.

8. Will resetting the Check Engine Light resolve OBDII code P0159 on a 2005 Infiniti G35?

- Simply resetting the Check Engine Light may temporarily clear the code, but it will likely return if the underlying issue causing the P0159 code is not addressed.

9. How much does it typically cost to repair OBDII code P0159 on a 2005 Infiniti G35?

- The cost of repairing OBDII code P0159 can vary depending on the exact cause, but it may range from $100 to $500 or more, including parts and labor.

10. Can a mechanic easily fix OBDII code P0159 on a 2005 Infiniti G35?

- A qualified mechanic should be able to diagnose and repair OBDII code P0159 efficiently by following the proper diagnostic procedures and utilizing the necessary tools and expertise.