AutoCodes – Toyota – P0136 2006 Toyota Highlander

P0136 2006 Toyota Highlander Code - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

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 Highlander indicates Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2.
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 4,077

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 Highlander 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 Highlander - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com — P0136 2006 Toyota Highlander Code - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

What does this mean?

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

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 Highlander?

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 Highlander 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 2006 Toyota Highlander 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 2006 Toyota Highlander Code

1. What does the OBDII code P0136 for a 2006 Toyota Highlander mean?

The code P0136 indicates an Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2 of the vehicle's exhaust system.

2. What are the common symptoms of a P0136 code in a Toyota Highlander?

Common symptoms of a P0136 code include poor fuel economy, rough idle, engine hesitation, and an illuminated check engine light on the dashboard.

3. What are the possible causes of a P0136 code in a 2006 Toyota Highlander?

Possible causes of a P0136 code include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the vehicle's engine computer.

4. How can I diagnose a P0136 code in my Toyota Highlander?

Diagnosing a P0136 code involves using an OBDII scanner to read the code, inspecting the oxygen sensor and its wiring, checking for exhaust leaks, and testing the sensor's voltage and response.

5. Can I still drive my Toyota Highlander with a P0136 code?

It is generally safe to drive your vehicle with a P0136 code, but it is recommended to have the issue diagnosed and repaired promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

6. How can I repair a P0136 code in my 2006 Toyota Highlander?

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

7. Is it possible to reset the P0136 code in a Toyota Highlander without repairing the issue?

While you can clear the code using an OBDII scanner, the check engine light will likely reappear if the underlying problem causing the P0136 code is not resolved.

8. How much does it typically cost to repair a P0136 code in a Toyota Highlander?

The cost of repairing a P0136 code can vary depending on the root cause of the issue and the prices of parts and labor, but it may range from $100 to $300 or more.

9. What happens if a P0136 code in a Toyota Highlander is ignored?

Ignoring a P0136 code can lead to decreased fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time, resulting in more costly repairs.

10. Can a DIY enthusiast fix a P0136 code in a Toyota Highlander?

Depending on their skill level and access to tools, a DIY enthusiast may be able to address a P0136 code by replacing the oxygen sensor, checking wiring, or fixing minor exhaust leaks.