AutoCodes – Toyota – P0136 2005 Toyota Highlander

P0136 2005 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 2005 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 5,414
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P0136 2005 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 2005 Toyota Highlander - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2 - AutoCodes.com
P0136 2005 Toyota Highlander Code - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

What are the Possible Causes of the DTC P0136 2005 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 2005 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.

Code Tech Notes

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0136 2005 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 2005 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 2005 Toyota Highlander Code

1. What does OBDII code P0136 mean for a 2005 Toyota Highlander?

The code P0136 indicates an Oxygen Sensor Circuit Malfunction for Bank 1 Sensor 2 in a 2005 Toyota Highlander.

2. What are the common symptoms of a P0136 code in a 2005 Toyota Highlander?

Common symptoms of a P0136 code include poor fuel economy, rough idling, and a noticeable decrease in engine performance.

3. What are the possible causes of a P0136 code in a 2005 Toyota Highlander?

Possible causes of a P0136 code include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the Engine Control Module (ECM).

4. How can I diagnose a P0136 code in my 2005 Toyota Highlander?

Diagnosing a P0136 code involves using an OBDII scanner to retrieve the code, inspecting the oxygen sensor and its wiring, checking for exhaust leaks, and testing the ECM.

5. Can I drive my 2005 Toyota Highlander with a P0136 code?

It is not recommended to drive your vehicle with a P0136 code as it can lead to further damage to the engine and emissions system.

6. How do I repair a P0136 code in my 2005 Toyota Highlander?

Repairing a P0136 code may involve replacing the oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, or reprogramming the ECM.

7. Are there any DIY tips for fixing a P0136 code in a 2005 Toyota Highlander?

DIY tips for fixing a P0136 code include checking and cleaning the oxygen sensor connections, inspecting the wiring for damage, and ensuring proper installation of a new sensor.

8. How much does it typically cost to repair a P0136 code in a 2005 Toyota Highlander?

The cost of repairing a P0136 code in a 2005 Toyota Highlander can vary depending on the exact cause, but it may range from $100 to $500 or more, including parts and labor.

9. How long does it take to repair a P0136 code in a 2005 Toyota Highlander?

The repair time for a P0136 code in a 2005 Toyota Highlander can vary depending on the specific issue, but it may take a few hours to a full day to complete the repair.

10. Can a P0136 code in a 2005 Toyota Highlander affect emissions testing?

Yes, a P0136 code can affect emissions testing results for a 2005 Toyota Highlander, potentially causing the vehicle to fail the test.

Discuss the causes and fixes for P0136 2005 Toyota Highlander OBDII Code

  • I have 05 highlander I replace the engine with a 03 Camry engine , I got po136 code which is the sensor I replace the sensor and still have check engine light .When car is cold starts up fine while idle but sounds like it going to shut off and rpm goes up on its own to about 2 Rpm .I have change the spark plugs , ignition coils , new sensor my next step is changing the fuel injectors can anyone advice what could be the problem .

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