AutoCodes – Toyota – P0136 2002 Toyota Highlander

P0136 2002 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 2002 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 12,337

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 2002 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 2002 Toyota Highlander - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com — P0136 2002 Toyota Highlander Code - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0136 2002 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 2002 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 2002 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 2002 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 2002 Toyota Highlander Code

1. What does the OBDII code P0136 on a 2002 Toyota Highlander indicate?

It indicates an Oxygen Sensor Circuit Malfunction for Bank 1 Sensor 2.

2. What are the common symptoms of a P0136 code in a 2002 Toyota Highlander?

Common symptoms include poor fuel economy, rough idling, and a noticeable decrease in engine performance.

3. What are the potential causes of a P0136 code in a 2002 Toyota Highlander?

Potential causes may include a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, or an exhaust leak near the sensor.

4. How can I diagnose the cause of a P0136 code in my 2002 Toyota Highlander?

You can use an OBDII scanner to check the code, visually inspect the sensor and its connections, and perform tests to measure the sensor's voltage output.

5. Can I drive my 2002 Toyota Highlander with a P0136 code?

It is not recommended to continue driving with a P0136 code as it can lead to further damage to the vehicle and may cause increased emissions.

6. How can I repair a P0136 code in my 2002 Toyota Highlander?

Repair options include replacing the oxygen sensor, repairing damaged wiring or connectors, and fixing any exhaust leaks near the sensor.

7. Can I reset the P0136 code on my 2002 Toyota Highlander without fixing the issue?

While you can clear the code with an OBDII scanner, the underlying issue causing the code will still need to be addressed to prevent it from reoccurring.

8. How much does it cost to fix a P0136 code in a 2002 Toyota Highlander?

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

9. Is it possible to prevent a P0136 code from appearing in my 2002 Toyota Highlander?

Regular maintenance, such as inspecting and replacing oxygen sensors at recommended intervals, can help prevent the occurrence of a P0136 code.

10. Can a DIY enthusiast repair a P0136 code in a 2002 Toyota Highlander?

While some may be able to replace the oxygen sensor themselves, diagnosing and repairing the underlying issue causing the P0136 code may require professional expertise.