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P0135 Lexus Code - Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Quick Answer

The P0135 diagnostic trouble code (DTC) for Lexus vehicles indicates a problem with the Heated Oxygen Sensor (HO2S) Heater Circuit for Bank 1 Sensor 1. Common causes include Faulty Oxygen Sensor: The most common cause of this code is a defective oxygen sensor with a faulty heater circuit, Wiring Issues: Damaged or corroded wiring connections to the oxygen sensor can prevent the heater circuit from functioning properly, Fuse Problem: A blown fuse in the oxygen sensor heater circuit can also trigger this code. 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
P0135 Lexus indicates Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1.
Common causes
Common causes include Faulty Oxygen Sensor: The most common cause of this code is a defective oxygen sensor with a faulty heater circuit, Wiring Issues: Damaged or corroded wiring connections to the oxygen sensor can prevent the heater circuit from functioning properly, Fuse Problem: A blown fuse in the oxygen sensor heater circuit can also trigger this code.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0135 Lexus Description

The P0135 diagnostic trouble code (DTC) for Lexus vehicles indicates a problem with the Heated Oxygen Sensor (HO2S) Heater Circuit for Bank 1 Sensor 1. This sensor is responsible for measuring the oxygen content in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater circuit in the sensor is designed to reach operating temperature quickly to provide accurate readings.

OBDII Code P0135 Lexus - Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1
P0135 Lexus Code - Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Common Causes of P0135 Lexus

  1. Faulty Oxygen Sensor: The most common cause of this code is a defective oxygen sensor with a faulty heater circuit.
  2. Wiring Issues: Damaged or corroded wiring connections to the oxygen sensor can prevent the heater circuit from functioning properly.
  3. Fuse Problem: A blown fuse in the oxygen sensor heater circuit can also trigger this code.
  4. ECM Malfunction: In rare cases, a malfunction in the engine control module (ECM) can cause issues with the oxygen sensor heater circuit.
  5. Exhaust Leak: An exhaust leak near the oxygen sensor can cause the heater circuit to malfunction.

Symptoms of P0135 Lexus

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Poor Fuel Economy: A faulty oxygen sensor heater circuit can lead to incorrect fuel mixture adjustments, resulting in decreased fuel efficiency.
  3. Rough Idling: The engine may idle roughly or inconsistently due to incorrect air-fuel mixture.
  4. Engine Misfires: A malfunctioning oxygen sensor can cause engine misfires, leading to poor performance and increased emissions.
  5. Failed Emissions Test: If the HO2S heater circuit is not functioning properly, the vehicle may fail an emissions test due to increased emissions.

How to Fix P0135 Lexus

  1. Diagnose the Issue: Use a scan tool to retrieve the trouble code and perform a visual inspection of the oxygen sensor and its wiring.
  2. Test the Oxygen Sensor: Check the resistance of the oxygen sensor heater circuit to determine if it is functioning properly.
  3. Check Wiring and Connections: Inspect the wiring and connections to the oxygen sensor for any damage or corrosion and repair as needed.
  4. Replace Oxygen Sensor: If the oxygen sensor heater circuit is faulty, replace the sensor with a new one to resolve the issue.
  5. Clear Codes and Test Drive: Clear the trouble codes from the ECM, then test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0135 Lexus

The cost of repairing a P0135 code for a Lexus vehicle can vary depending on the specific model and year. In general, the price of a new oxygen sensor with a heater circuit for Bank 1 Sensor 1 can range from $100 to $300. Labor costs for the repair can range from $100 to $200, depending on the shop's hourly rate and the complexity of the repair. Additional costs may include diagnostic fees and any other parts or materials needed for the repair. It's recommended to contact local auto repair shops for accurate cost estimates based on your specific vehicle.

What does this mean?

Tech Notes for P0135 Lexus

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it take the sensor to warm up and start sending an adequate signal. The code is triggered when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the sensor and connector are OK, replacing the O2 Sensor 1 usually takes care of the problem

When is the Code Detected?

Current amperage in the front heated oxygen sensor heater circuit is out of the normal range. (An improper voltage drop signal is sent to ECM through the front heated oxygen sensor heat

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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 P0135 Lexus Code

1. What are the common symptoms of an OBDII code P0135 in a Lexus?

- Common symptoms include poor fuel economy, rough idling, engine stalling, and an illuminated check engine light.

2. What does the OBDII code P0135 in a Lexus indicate?

- The code P0135 indicates a malfunction in the heated oxygen sensor heater circuit for Bank 1 Sensor 1.

3. What are the possible causes of a P0135 code in a Lexus?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a problem with the ECM.

4. How can I diagnose a P0135 code in my Lexus?

- Diagnose the code by checking the oxygen sensor's resistance, inspecting the wiring and connectors for damage, and testing the heater circuit with a multimeter.

5. Can I drive my Lexus with a P0135 code?

- It is not recommended to drive your Lexus with a P0135 code as it can lead to poor engine performance and potentially cause damage to other components.

6. How can I repair a P0135 code in my Lexus?

- Repair options include replacing the oxygen sensor, repairing any damaged wiring or connectors, checking and replacing fuses if needed, and resetting the ECM.

7. Will resetting the check engine light resolve a P0135 code in a Lexus?

- Resetting the check engine light may temporarily clear the code, but it will likely return if the underlying issue is not addressed through proper diagnosis and repair.

8. Are there any maintenance tips to prevent a P0135 code in my Lexus?

- Regularly inspecting and replacing oxygen sensors as part of your vehicle's maintenance schedule can help prevent issues like a P0135 code from occurring.

9. Can a DIY enthusiast fix a P0135 code in a Lexus?

- Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair a P0135 code in a Lexus, but professional help is recommended for complex issues.

10. How much does it cost to repair a P0135 code in a Lexus?

- The cost of repairing a P0135 code can vary depending on the root cause of the issue, but expenses may include parts such as an oxygen sensor, wiring repairs, and labor costs if professional help is sought.

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