AutoCodes – Isuzu – P0136 Isuzu

P0136 Isuzu Code - HO2S Circuit 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 Isuzu indicates HO2S Circuit 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 6,203

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 Isuzu 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 Isuzu - HO2S Circuit Sensor 2 - AutoCodes.com — P0136 Isuzu Code - HO2S Circuit Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0136 Isuzu?

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 Isuzu?

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 Isuzu 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 Isuzu Code

1. What does OBDII code P0136 Isuzu indicate?

- OBDII code P0136 for Isuzu refers to a fault in the HO2S (Heated Oxygen Sensor) Circuit Sensor 2, which is located after the catalytic converter.

2. What are the common symptoms of a P0136 Isuzu code?

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

3. What are the potential causes of a P0136 Isuzu code?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, exhaust leaks near the sensor, or issues with the engine's air-fuel mixture.

4. How can I diagnose a P0136 Isuzu code?

- Diagnosing a P0136 code typically involves using an OBDII scanner to read the code, inspecting the oxygen sensor and its wiring for damage, and checking for exhaust leaks near the sensor.

5. Can I still drive my vehicle with a P0136 Isuzu code?

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

6. How can I repair a P0136 Isuzu code?

- Repair options may include replacing the HO2S Sensor 2, repairing or replacing damaged wiring or connectors, fixing any exhaust leaks, and clearing the trouble code with an OBDII scanner.

7. Is it possible to prevent the recurrence of a P0136 Isuzu code?

- Regular maintenance of the oxygen sensors, ensuring proper engine operation, and promptly addressing any engine issues can help prevent the recurrence of a P0136 Isuzu code.

8. Can a DIY enthusiast fix a P0136 Isuzu code?

- Depending on your skill level and access to tools, you may be able to replace the oxygen sensor or repair wiring yourself. However, complex diagnostics may require professional help.

9. How long does it take to repair a P0136 Isuzu code?

- The repair time for a P0136 code can vary based on the exact cause and your experience level. It may take anywhere from 30 minutes to a few hours to complete the repair.

10. Will resetting the check engine light resolve a P0136 Isuzu code?

- Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing the P0136 code. It is essential to diagnose and address the problem to prevent its recurrence.