AutoCodes – Toyota – P0136 2005 Toyota Corolla

P0136 2005 Toyota Corolla Code - HO2S12 Circuit Malfunction 3ZZ-FE Engine

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 2005 Toyota Corolla indicates HO2S12 Circuit Malfunction 3ZZ-FE Engine.
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 6,571

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 2005 Toyota Corolla 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 2005 Toyota Corolla - HO2S12 Circuit Malfunction 3ZZ-FE Engine - AutoCodes.com — P0136 2005 Toyota Corolla Code - HO2S12 Circuit Malfunction 3ZZ-FE Engine

What does this mean?

What are the Possible Causes of the DTC P0136 2005 Toyota Corolla?

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
EFI relay

How to Fix the DTC P0136 2005 Toyota Corolla?

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 2005 Toyota Corolla 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 P0136 2005 Toyota Corolla code?

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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 2005 Toyota Corolla Code

1. What does OBDII code P0136 for a 2005 Toyota Corolla with a 3ZZ-FE engine indicate?

The code P0136 indicates a malfunction in the oxygen sensor (HO2S12) circuit for bank 1 sensor 2 in a 2005 Toyota Corolla.

2. What are the common symptoms of OBDII code P0136 in a 2005 Toyota Corolla?

Common symptoms of code P0136 may include poor fuel economy, rough idling, engine misfires, and an illuminated check engine light on the dashboard.

3. What are the possible causes of HO2S12 circuit malfunction in a 2005 Toyota Corolla?

Possible causes of HO2S12 circuit malfunction can include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine control module (ECM).

4. How can I diagnose the HO2S12 circuit malfunction in my 2005 Toyota Corolla?

Diagnosing the issue involves using an OBDII scanner to retrieve the fault code, inspecting the oxygen sensor and its connections, checking for exhaust leaks, and testing the wiring for continuity and proper voltage.

5. Can I drive my 2005 Toyota Corolla with OBDII code P0136?

It is not recommended to drive for an extended period with code P0136 as it can lead to poor engine performance and potential damage. It's best to address the issue promptly.

6. How can I repair OBDII code P0136 in my 2005 Toyota Corolla?

Repairing code P0136 may involve replacing the oxygen sensor, repairing damaged wiring or connectors, fixing any exhaust leaks, or resetting the ECM after addressing the issue.

7. Will resetting the check engine light resolve OBDII code P0136 in my 2005 Toyota Corolla?

Simply resetting the check engine light will not fix the underlying issue causing code P0136. It's important to diagnose and repair the root cause of the problem.

8. Can a DIY enthusiast fix OBDII code P0136 in a 2005 Toyota Corolla?

Depending on their skill level, a DIY enthusiast may be able to diagnose and repair code P0136 by following a step-by-step guide or seeking assistance from online resources and forums.

9. How much does it typically cost to repair OBDII code P0136 in a 2005 Toyota Corolla at a repair shop?

The cost of repairing code P0136 can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor at a repair shop.

10. How often does OBDII code P0136 occur in a 2005 Toyota Corolla with a 3ZZ-FE engine?

Code P0136 can occur sporadically or more frequently depending on driving conditions, maintenance history, and the overall health of the vehicle's oxygen sensor and related components.