AutoCodes – Toyota – P0136 2002 Toyota Echo

P0136 2002 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 2002 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 4,618

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

What does this mean?

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

1. What are the common symptoms of OBDII code P0136 on a 2002 Toyota Echo?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.

2. What does the OBDII code P0136 mean on a 2002 Toyota Echo?

- OBDII code P0136 indicates an Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2, which is the downstream oxygen sensor located after the catalytic converter.

3. What are the possible causes of OBDII code P0136 on a 2002 Toyota Echo?

- Potential causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, engine misfires, or issues with the engine's computer system.

4. How can I diagnose the OBDII code P0136 on my 2002 Toyota Echo?

- Diagnosing the code involves using an OBDII scanner to retrieve the code, visually inspecting the oxygen sensor and related components, and checking for any visible signs of damage or corrosion.

5. Can I continue driving my 2002 Toyota Echo with OBDII code P0136?

- While you may be able to drive the vehicle for a short period with this code, it is recommended to address the issue promptly to prevent potential damage to other engine components and ensure optimal performance.

6. How can I repair OBDII code P0136 on my 2002 Toyota Echo?

- Repair options may include replacing the downstream oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, addressing engine misfires, or resetting the engine computer.

7. Is it possible to reset the check engine light after fixing OBDII code P0136 on a 2002 Toyota Echo?

- Yes, the check engine light can be reset using an OBDII scanner after addressing the underlying issue causing the code P0136.

8. How much does it cost to repair OBDII code P0136 on a 2002 Toyota Echo?

- The cost of repair can vary depending on the specific cause of the code, but it may involve expenses for parts, labor, and diagnostic services.

9. Can a DIY enthusiast fix OBDII code P0136 on a 2002 Toyota Echo?

- Depending on the skill level and tools available, some DIY enthusiasts may be able to address this code by following repair guides and utilizing basic automotive repair knowledge.

10. How often should the oxygen sensors be replaced in a 2002 Toyota Echo to prevent OBDII code P0136?

- Oxygen sensors typically have a lifespan of around 60,000 to 100,000 miles, so it is recommended to replace them within this mileage range to prevent issues like code P0136 from occurring.