AutoCodes – Toyota – P0136 2001 Toyota Echo

P0136 2001 Toyota Echo 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 Echo 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 4,220

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

What does this mean?

What are the Possible Causes of the DTC P0136 2001 Toyota Echo?

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 Echo?

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 Echo 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 2001 Toyota Echo Code

1. What does the OBDII code P0136 mean on a 2001 Toyota Echo?

The OBDII code P0136 indicates that there is a malfunction in the oxygen sensor circuit of Bank 1 Sensor 2. This sensor is located behind the catalytic converter and monitors the efficiency of the catalytic converter by measuring the oxygen levels in the exhaust gases.

2. What are the common symptoms of code P0136 in a 2001 Toyota Echo?

Symptoms of code P0136 may include poor fuel economy, rough engine idle, a noticeable drop in engine performance, and the Check Engine Light coming on.

3. What can cause the P0136 code to appear in a 2001 Toyota Echo?

Common causes of the P0136 code include a faulty oxygen sensor, damaged or corroded wiring or connectors in the oxygen sensor circuit, exhaust leaks near the sensor, or a faulty engine control module.

4. How do I fix the P0136 code in a 2001 Toyota Echo?

To fix the P0136 code, start by inspecting the oxygen sensor wiring and connectors for damage or corrosion. If the wiring is intact, consider replacing the oxygen sensor itself. Also, check for any exhaust leaks that need to be repaired.

5. Is it safe to drive my 2001 Toyota Echo with the P0136 code?

While you can still drive your vehicle with the P0136 code, it is advisable to address the issue as soon as possible. Ignoring this code can lead to reduced fuel efficiency, increased emissions, and potentially more severe engine problems.

6. How do I verify that the new oxygen sensor has resolved the P0136 code on my 2001 Toyota Echo?

After replacing the oxygen sensor, clear the P0136 code from the ECU using an OBDII scanner. Then, drive the vehicle for a few days under various conditions. If the Check Engine Light does not return and no further codes are stored, this typically indicates the issue has been resolved.

7. Can a DIYer replace the oxygen sensor to fix the P0136 code, or should it be done by a professional?

Replacing an oxygen sensor is a manageable task for a DIYer with some mechanical experience. However, ensure you have the correct tools and follow proper safety procedures. If you are unsure, it is advisable to consult with a professional mechanic.

8. What tools are needed to diagnose the P0136 code on a 2001 Toyota Echo?

To diagnose the P0136 code, you will need an OBDII scanner to read the code and monitor live data. Additionally, a digital multimeter can be useful for checking the oxygen sensor's voltages and the integrity of the wiring.

9. Could there be other related codes that appear with P0136 on a 2001 Toyota Echo?

Yes, related codes that might appear with P0136 include other oxygen sensor codes like P0135 (oxygen sensor heater circuit malfunction) or P0137 (oxygen sensor circuit low voltage). It is important to address all related codes simultaneously to ensure a comprehensive repair.