AutoCodes – Toyota – P0158 2008 Toyota Camry

P0158 2008 Toyota Camry Code - Oxygen Sensor Circuit High Voltage Bank 2 Sensor 2

Quick Answer

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a TWC is used. Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, EFI Relay, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted. 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 2008 Toyota Camry indicates Oxygen Sensor Circuit High Voltage Bank 2 Sensor 2.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, EFI Relay, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted.
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 5,340

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 19, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0158 2008 Toyota Camry Description

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a TWC is used. For the most efficient use of the TWC, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel level. For the purpose of helping the ECM to deliver accurate air-fuel ratio control, a Heated Oxygen (HO2) sensor is used.
The HO2 sensor is located behind the TWC, and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low). When the air-fuel ratio becomes lean, the oxygen concentration in the exhaust gas is rich. The HO2 sensor informs the ECM that the post-TWC air-fuel ratio is lean (low voltage, i.e. less than 0.45 V). Conversely, when the air-fuel ratio is richer than the stoichiometric air-fuel level, the oxygen concentration in the exhaust gas becomes lean. The HO2 sensor informs the ECM that the post-TWC air-fuel ratio is rich (high voltage, i.e. more than 0.45 V). The HO2 sensor has the property of changing its output voltage drastically when the air-fuel ratio is close to the stoichiometric level.
The ECM uses the supplementary information from the HO2 sensor to determine whether the air-fuel ratio after the TWC is rich or lean, and adjusts the fuel injection time accordingly. Thus, if the HO2 sensor is working improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air-fuel ratio control.

OBDII Code P0158 2008 Toyota Camry - Oxygen Sensor Circuit High Voltage Bank 2 Sensor 2 - AutoCodes.com — P0158 2008 Toyota Camry Code - Oxygen Sensor Circuit High Voltage Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0158 2008 Toyota Camry?

Faulty Rear Heated Oxygen Sensor Bank 2
EFI Relay
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 2008 Toyota Camry?

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.

There is a factory service bulletin for the following Toyota models:
2008 Toyota Camry
2008 Toyota Camry Service Bulletin OBDII Code P0158

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0158 2008 Toyota Camry 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 2008 Toyota Camry code?

Need more information on how to fix the P0158 2008 Toyota Camry code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0158 2008 Toyota Camry 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 2008 Toyota Camry Code

1. What are the common symptoms of OBDII code P0158 on a 2008 Toyota Camry?

The common symptoms of code P0158 include poor fuel economy, rough idling, engine hesitation, and an illuminated check engine light.

2. What does the OBDII code P0158 mean for a 2008 Toyota Camry?

OBDII code P0158 indicates an issue with the oxygen sensor circuit high voltage on Bank 2 Sensor 2 in a 2008 Toyota Camry.

3. What are the possible causes of OBDII code P0158 on a 2008 Toyota Camry?

Possible causes of code P0158 on a 2008 Toyota Camry include a faulty oxygen sensor, wiring or connector issues, exhaust leaks, or a malfunctioning engine control module (ECM).

4. How can I diagnose the OBDII code P0158 on my 2008 Toyota Camry?

Diagnosing code P0158 involves using an OBDII scanner to retrieve the code and then inspecting the oxygen sensor, wiring connections, and the ECM for any signs of damage or malfunction.

5. How do I repair OBDII code P0158 on a 2008 Toyota Camry?

Repairing code P0158 typically involves replacing the Bank 2 Sensor 2 oxygen sensor, repairing any damaged wiring or connectors, and clearing the code with an OBDII scanner.

6. Can I drive my 2008 Toyota Camry with OBDII code P0158?

It is not recommended to drive your 2008 Toyota Camry with code P0158 as it can lead to poor engine performance and potential damage to the catalytic converter.

7. How much does it cost to fix OBDII code P0158 on a 2008 Toyota Camry?

The cost to fix code P0158 on a 2008 Toyota Camry can vary depending on the cause of the issue, but it typically includes the cost of a new oxygen sensor and labor for installation.

8. How often should the oxygen sensors be replaced on a 2008 Toyota Camry?

Oxygen sensors on a 2008 Toyota Camry typically last around 100,000 miles, but it's recommended to follow the manufacturer's maintenance schedule for specific guidelines on replacement.

9. Will resetting the check engine light fix OBDII code P0158 on a 2008 Toyota Camry?

Resetting the check engine light may temporarily turn off the light, but it will not fix the underlying issue causing code P0158. It's important to diagnose and repair the problem to prevent further issues.

10. Can a DIY enthusiast repair OBDII code P0158 on a 2008 Toyota Camry?

Depending on the level of expertise, a DIY enthusiast may be able to repair code P0158 by following a detailed repair guide and using the necessary tools to replace the oxygen sensor and check wiring connections.