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

Quick Answer

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground. 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 Toyota indicates Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1.
Common causes
Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse, Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground.
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 106,455
How popular is this code, among other codes? Medium
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Table of contents Created and updated by William Orellana on Aug 15, 2020
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Code P0135 Toyota Description

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
OBDII Code P0135 Toyota - Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1 - AutoCodes.com
P0135 Toyota Code - Heated Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 1
What does this mean?

What are the Possible Causes of the DTC P0135 Toyota?

  • Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
  • Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse
  • Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit open shorted to ground
  • Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0135 Toyota?

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

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.





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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0135 Toyota 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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Information for Specific Toyota Models

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 Toyota Code

What does the OBDII code P0135 mean on a Toyota?

Code P0135 indicates a malfunction in the heater circuit of the oxygen sensor located in Bank 1 Sensor 1, which is the upstream sensor before the catalytic converter.

What are the common symptoms of code P0135 in a Toyota?

The common symptoms include an illuminated check engine light, reduced fuel efficiency, increased emissions, and possibly rough idling during engine warm-up.

What causes code P0135 on a Toyota?

The most common causes are a blown fuse, a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning engine control module (ECM).

Can I drive my Toyota with a P0135 code?

While the car may still be drivable, ignoring the issue may lead to poor fuel economy, higher emissions, and potential damage to the catalytic converter over time.

How do I diagnose a P0135 code on a Toyota?

Diagnosis typically involves checking the oxygen sensor heater circuit for power, inspecting the wiring and connectors for damage, testing the sensor's resistance, and verifying the function of the ECM.

How do I fix a P0135 code on a Toyota?

Repairs may include replacing the faulty oxygen sensor, repairing damaged wiring or connectors, replacing a blown fuse, or, in rare cases, repairing or reprogramming the ECM.

How much does it cost to fix a P0135 code on a Toyota?

The cost to fix this issue can range from $150 to $400, depending on whether the oxygen sensor needs replacement and labor charges in your area.

Can a bad oxygen sensor cause a P0135 code?

Yes, a malfunctioning oxygen sensor is one of the most common causes of the P0135 code since its heater circuit is the component being monitored.

Does a P0135 code affect emissions?

Yes, a faulty oxygen sensor or heater circuit can cause improper air-fuel mixture readings, leading to increased emissions and potential failure of emissions testing.

How can I prevent a P0135 code on my Toyota?

Regular maintenance, including inspecting and replacing oxygen sensors as needed and ensuring wiring and connectors are in good condition, can help prevent this issue.

Discuss the causes and fixes for P0135 Toyota OBDII Code

Submit a New Comment

  • ENg check light is on after driving at some distance,not to drive well with prior velocity.Higher temperature was felt although not showing increased heat.Replaced sensor .
    Engine check light is off and everything is OK.

    Reply to Comment
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