AutoCodes – Pontiac – P0158 Pontiac

P0158 Pontiac Code - HO2S Circuit High Voltage Bank 2 Sensor 2

Quick Answer

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. 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 Pontiac indicates HO2S Circuit High Voltage Bank 2 Sensor 2.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,613

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 May 27, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0158 Pontiac Description

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Engine Control Module (ECM) operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0 - 1, 000 mV. Once sufficient HO2S voltage fluctuation is observed by the ECM, Closed Loop is entered. The ECM uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S voltage is greater than 1, 050 mV.

OBDII Code P0158 Pontiac - HO2S Circuit High Voltage Bank 2 Sensor 2 - AutoCodes.com — P0158 Pontiac Code - HO2S Circuit High Voltage Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0158 Pontiac?

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
Low or high fuel system pressure
Fuel contamination
Faulty fuel injectors
Exhaust gas leaks
Engine vacuum leaks

How to Fix the DTC P0158 Pontiac?

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 Pontiac 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 P0158 Pontiac code?

Need more information on how to fix the P0158 Pontiac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0158 Pontiac code diagnosed by a professional: Find a repair shop in your area

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 Pontiac Code

1. What are the common symptoms of OBDII code P0158 Pontiac (HO2S Circuit High Voltage Bank 2 Sensor 2)?

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

2. What can cause the OBDII code P0158 Pontiac to trigger?

- The code P0158 Pontiac is triggered when the HO2S (Heated Oxygen Sensor) circuit for Bank 2 Sensor 2 detects a high voltage condition.

3. How can I diagnose the cause of OBDII code P0158 Pontiac?

- Diagnosing the cause of P0158 involves checking the wiring and connectors related to Bank 2 Sensor 2, as well as testing the sensor itself for proper functioning.

4. What are some possible repair tips for addressing OBDII code P0158 Pontiac?

- Repair tips may include inspecting and repairing any damaged wiring, replacing the Bank 2 Sensor 2 if faulty, and clearing the code to see if it returns.

5. Can driving with OBDII code P0158 Pontiac (HO2S Circuit High Voltage Bank 2 Sensor 2) cause further damage to the vehicle?

- Continuing to drive with P0158 may lead to reduced fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.

6. Is it safe to ignore OBDII code P0158 Pontiac and continue driving the vehicle?

- Ignoring P0158 can lead to decreased fuel economy and potential engine damage, so it is recommended to address the issue promptly.

7. How much does it typically cost to repair OBDII code P0158 Pontiac?

- The cost of repairing P0158 can vary depending on the root cause, but it may involve expenses for parts like the Bank 2 Sensor 2 and labor for diagnostics and installation.

8. Are there any DIY solutions for fixing OBDII code P0158 Pontiac?

- DIY solutions may include visually inspecting the sensor and its connections, cleaning the sensor if contaminated, or replacing the sensor if necessary.

9. Can a faulty oxygen sensor cause OBDII code P0158 Pontiac (HO2S Circuit High Voltage Bank 2 Sensor 2)?

- Yes, a faulty oxygen sensor (Bank 2 Sensor 2) can trigger P0158, as it may send incorrect voltage readings to the vehicle's ECU.

10. How long does it take to repair OBDII code P0158 Pontiac at a professional auto repair shop?

- The repair time for P0158 can vary depending on the exact cause and the shop's workload, but it typically takes a few hours to diagnose and replace the sensor if needed.