AutoCodes – Toyota – P0136 2006 Toyota Prius

P0136 2006 Toyota Prius Code - HO2S12 Circuit Malfunction

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 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 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: P0136 2006 Toyota Prius indicates HO2S12 Circuit Malfunction.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 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 3,434

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
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0136 2006 Toyota Prius 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 P0136 2006 Toyota Prius - HO2S12 Circuit Malfunction - AutoCodes.com — P0136 2006 Toyota Prius Code - HO2S12 Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0136 2006 Toyota Prius?

Faulty Rear Heated Oxygen Sensor Bank 1
Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

How to Fix the DTC P0136 2006 Toyota Prius?

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 1 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0136 2006 Toyota Prius 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 P0136 2006 Toyota Prius Code

1. What does the OBDII code P0136 indicate for a 2006 Toyota Prius?

- The code P0136 for a 2006 Toyota Prius signifies a malfunction in the HO2S12 (Heated Oxygen Sensor 1 Bank 1 Sensor 2) circuit.

2. What are the common symptoms of a P0136 error in a 2006 Toyota Prius?

- Common symptoms may include poor fuel economy, rough idling, hesitation during acceleration, and the illumination of the check engine light.

3. What are the possible causes of a HO2S12 circuit malfunction in a 2006 Toyota Prius?

- The causes can range from a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, to issues with the engine's fuel system.

4. How can I diagnose a P0136 error in my 2006 Toyota Prius?

- Diagnostic steps may involve inspecting the oxygen sensor and its connections, checking for exhaust leaks, testing the sensor's voltage output, and scanning for related trouble codes.

5. Can I continue to drive my 2006 Toyota Prius with a P0136 code?

- While the vehicle may still be operational, it is recommended to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal fuel efficiency.

6. How can I repair a HO2S12 circuit malfunction in my 2006 Toyota Prius?

- Repair options include replacing the faulty oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, and resetting the error code using an OBDII scanner.

7. Is it possible to reset the P0136 code in a 2006 Toyota Prius without fixing the underlying issue?

- Simply resetting the code without addressing the root cause may lead to the check engine light reappearing once the system detects the ongoing fault.

8. How much should I expect to pay for repairing a P0136 error in a 2006 Toyota Prius?

- The cost of repairs can vary depending on the specific issue, but it may involve expenses for parts such as the oxygen sensor, labor costs, and diagnostic fees.

9. Can a DIY enthusiast fix a P0136 error in a 2006 Toyota Prius?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address the P0136 issue by following repair guides and utilizing basic automotive knowledge.

10. How frequently does the HO2S12 circuit malfunction occur in a 2006 Toyota Prius?

- The occurrence of a P0136 error can vary, but regular maintenance and timely replacement of oxygen sensors can help reduce the likelihood of experiencing this issue.