AutoCodes – Audi – P0158 Audi

P0158 Audi Code - HO2S22 Sensor 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 Audi indicates HO2S22 Sensor 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 7,505

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0158 Audi 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 Audi - HO2S22 Sensor Circuit High Voltage - AutoCodes.com — P0158 Audi Code - HO2S22 Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0158 Audi?

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 Audi?

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 Audi 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 Audi Code

1. What are the common symptoms of OBDII code P0158 in an Audi related to the HO2S22 sensor circuit high voltage?

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

2. What are the possible causes of OBDII code P0158 in an Audi?

- The code P0158 in an Audi can be caused by a faulty HO2S22 sensor, wiring issues in the sensor circuit, a vacuum leak, or an exhaust leak.

3. How can I diagnose the OBDII code P0158 in my Audi?

- Diagnosing the code involves using an OBDII scanner to retrieve the code, performing a visual inspection of the sensor and its wiring, and testing the sensor for proper voltage readings.

4. Can a dirty or contaminated sensor cause the OBDII code P0158 in an Audi?

- Yes, a dirty or contaminated HO2S22 sensor can lead to false readings and trigger the code P0158. Cleaning or replacing the sensor may resolve the issue.

5. What are some repair tips for fixing OBDII code P0158 in an Audi?

- Repair tips include checking and cleaning the sensor connector, inspecting the wiring for damage, testing the sensor's voltage output, and replacing the sensor if necessary.

6. Is it safe to continue driving my Audi with the OBDII code P0158 present?

- It is generally not recommended to drive with the code P0158 present, as it can lead to poor engine performance and potential damage if left unresolved.

7. How much does it typically cost to repair OBDII code P0158 in an Audi?

- The repair cost for OBDII code P0158 in an Audi can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can I reset the Check Engine Light after fixing OBDII code P0158 in my Audi?

- Yes, once the issue causing the code P0158 is resolved, the Check Engine Light can be reset using an OBDII scanner to clear the code.

9. Are there any preventive maintenance steps to avoid OBDII code P0158 in an Audi?

- Regularly inspecting and cleaning the HO2S22 sensor, ensuring proper engine maintenance, and addressing any issues promptly can help prevent the code P0158 from occurring.

10. How long does it take to repair OBDII code P0158 in an Audi?

- The repair time for OBDII code P0158 in an Audi can vary depending on the specific issue, but it may take anywhere from 1 to 3 hours to diagnose and fix the problem.