AutoCodes – Toyota – P0136 2001 Toyota Highlander

P0136 2001 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 2001 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 6,948

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 2001 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 2001 Toyota Highlander - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com — P0136 2001 Toyota Highlander Code - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0136 2001 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 2001 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 2001 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 2001 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 2001 Toyota Highlander Code

1. What does OBDII code P0136 on a 2001 Toyota Highlander indicate?

This code refers to an Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2, which is the downstream oxygen sensor after the catalytic converter.

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

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

3. What are the potential causes of a P0136 code in a 2001 Toyota Highlander?

Possible causes include a faulty oxygen sensor, damaged wiring or connectors in the oxygen sensor circuit, exhaust system leaks, or an issue with the engine's air-fuel ratio.

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

Diagnosing this code typically involves using an OBDII scanner to read the code, inspecting the oxygen sensor and its wiring for damage, checking for exhaust leaks, and testing the sensor's voltage output.

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

It is generally not recommended to drive with a P0136 code, as it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.

6. How can I repair a P0136 code in my 2001 Toyota Highlander?

Repair options may include replacing the Bank 1 Sensor 2 oxygen sensor, repairing damaged wiring or connectors, fixing any exhaust leaks, or addressing issues with the air-fuel mixture.

7. Will resetting the check engine light make the P0136 code go away?

Resetting the check engine light may temporarily clear the code, but if the underlying issue causing the P0136 code is not addressed, the code is likely to return.

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

The cost of repairing a P0136 code can vary depending on the specific issue causing the code, but it may range from $100 to $400 for parts and labor.

9. Can I replace the Bank 1 Sensor 2 oxygen sensor in my Toyota Highlander myself?

If you have the necessary tools and experience working on vehicles, you may be able to replace the oxygen sensor yourself. However, it is recommended to consult a professional if you are unsure.

10. How often should the oxygen sensors in a Toyota Highlander be replaced?

Oxygen sensors typically last around 60,000 to 90,000 miles, but it's a good idea to follow the manufacturer's recommended maintenance schedule for your specific vehicle.